Forecasting the Impact of Gross Domestic Product (GDP) on International Tourist Arrivals to Langkawi, Malaysia: A PostCOVID ‐ 19 Future

: This research first aims to forecast tourist arrivals to Langkawi, Malaysia from its top three source markets, namely, China, Saudi Arabia, and the United Kingdom, between 2020 and 2022. Using the annual gross domestic product (GDP) growth of those three countries, the study seeks to investigate the impact of GDP on tourist arrivals from these countries to Langkawi in the context of post ‐ COVID ‐ 19 scenarios. The study uses expert modelers, namely, ARIMA models and Holt’s lin ‐ ear models, to find the best fit model. Then, linear regression analysis was conducted to assess the impact of GDP on tourist arrivals in Langkawi from the said three countries. The results from the Holt linear model predicted a significant increase in the number of tourist arrivals from China and Saudi Arabia from 2020–2022. In contrast, the number of forecasted tourist arrivals from the United Kingdom would be on a decreasing trend from 2020–2022. It is also predicted that GDP growth will influence the tourist arrival trends from China and Saudi Arabia, but not for UK tourists. In other words, a speedy rate of recovery in the number of tourists from the UK to Langkawi is forecasted for once international travel restrictions are lifted, as the world eases into the post ‐ pandemic period. Using an expert modeler, the present study has predicted the number of tourist arri ‐ vals from China, Saudi Arabia, and the UK to Langkawi from 2020–2022. Using the Holt linear model, the present study forecasted the number of tourist arrivals from China to Langkawi at 359,358 in 2020, 409,686 in 2021, and 460,015 in 2022. The same model was used to forecast Saudi Arabian tourist arrivals. The results indicated a steady increase of tourist arrival trends from the country from 170,227 in 2020 to 179,742 in 2021 and 189,257 in 2022. The ARIMA model was then used to forecast the UK’s tourist arrivals. The result showed a static trend, which remains at 97,431 from 2020–2022. The R ‐ square values of 0.848 for China, 0.916 for Saudi Arabia, and 0.834 for the UK indicated a good forecasting performance for all the three top source markets to Langkawi.


Introduction
Tourism is a very important industry in Malaysia that has a far-reaching impact on the country's economic, social, and cultural development. It is the third major foreign exchange earner, after manufacturing and palm oil. It plays a significant role in the Malaysian economy through employment generation and the expansion of various related industries, such as food, accommodation, and transportation. Culturally, the tourism industry leads to the enrichment of and a greater appreciation for local cultures, traditional dances, costumes, handicrafts, and folk arts, which, in turn, lead to the growth of local trades and businesses related to cultural products.
The rapid growth of the tourism industry in Malaysia can be seen from the steady increase in tourist arrivals and tourist receipts. Recent statistics from Tourism Malaysia recorded a significant increase in tourist arrivals, from 25.72 million in 2015 to 26.10 million in 2019. A positive trend can be seen from tourist receipts, which increased from USD 16.5 billion in 2015 to USD 20.6 billion in 2019 [1]. In late 2019, a year-long Visit Malaysia Year 2020 program was strategically planned by the Ministry of Tourism, Arts and Culture Malaysia to bring in an estimated 30 million tourists, with a total estimated receipt of USD 23.9 billion. However, the grand national plan by the ministry to launch the campaign has been called off, due to the COVID-19 pandemic [2].
Langkawi is the top tourism island destination in Malaysia. Langkawi's tourism industry has remained strong and vibrant, as indicated by the steady increase in tourist arrivals and receipts for the past five years. Tourism statistics indicate a significant increase in tourist arrivals, from 3.06 million in 2012 to 3.62 million in 2015. Similarly, tourist receipts grew, from USD 641 million in 2012 to USD 962 million in 2015 [3]. Despite the 2014-2015 global and regional economic downturn, the average per diem expenditure in Langkawi has grown from USD 140 in 2013 to USD 152 in 2019. The average per capita expenditure has also increased, from USD 582 in 2013 to USD 742 in 2014, dropping slightly in 2015 to USD 704 in response to the mysterious disappearance of Malaysian Airlines flight MH370, the tragic flight MH17 that was shot down over Ukraine, and other global financial issues, before rising to USD 742 in 2019. The two incidents that occurred within a four-month period severely impacted the tourism industry, resulting in fewer visitors. The average length of stay, which was, earlier, on an upward trend, from 4.20 days in 2013 to 4.31 days in 2014, dropped dramatically in 2015 to 4.02 days in response to these tragedies, before regaining the previous 4.31 days in 2019. Tourists from China, Europe, and the Middle East contributed more than 70% of the total number of international tourists to Langkawi, at 571,199 in 2019 [3,4].
Despite the sector's proven resilience in moderating the impact of various global incidents in the past, the swift outbreak of COVID-19 jolted the tourism industry of Langkawi. Based on statistics released by the Langkawi Development Authority, the number of visitor arrivals (domestic and international) in 2020 dropped from 3,924,326 in 2019 to only 1,281,107 as of August 2020 [5].
In view of the issues highlighted above, the present study aims to forecast tourist arrivals in Langkawi from its top three source markets, namely, China, Saudi Arabia, and the United Kingdom, for the years 2020-2022. Using the annual gross domestic product (GDP) growth of the three countries, the study seeks to investigate whether the GDP of the three countries would have any significant impact on tourist arrivals to the island.

The Impact of GDP on Tourist Arrivals in the Post-Pandemic Era
GDP is an important indicator of the economic growth of a country. The term generally refers to all of the output generated within the borders of a country. GDP measures all values of goods and services produced within a country, normally for a year [6]. Past forecasting studies have long documented the positive relationships between the GDP of a country and the number of tourists [7,8]. A good GDP would indicate strong economic growth, good tourism infrastructures, and a safe environment, ensuring a higher tourism growth for a country or destination. However, past studies that measured the impact of the GDP of the tourists' countries of origin on the number of international tourists visiting host countries are severely lacking, except for a few studies by Croes and Vanegas [9], Luzzi and Flückiger [10], and Ghani [11]. In other words, less is known about how the annual GDP growth of the tourists' country of origin predicts the number of inbound tourists to the host country. Would the GDP of the tourists' countries of origin influence the number of inbound tourists to the host destination? The gap is even more evident in the context of a specific destination, such as Langkawi, in the post-pandemic era.
The global pandemic has caused a major collapse of the global economy, typically measured in GDP. The International Monetary Fund (IMF) reported a contraction of −3.5% of global economies [12]. In 2020, Malaysia's economy contracted by −5.6%, compared to 4.4% in 2019 [13]. The UK recorded a major GDP drop to −9.8%, compared to 1.4% in 2019. Saudi Arabia dropped to −4.1%, compared to 0.3% in 2019. China is the only major economy in the world with a positive GDP in 2020 at 2.3%, compared to 6% in 2019 [12].
COVID-19 was first detected in Wuhan, China in December 2019. As of late December 2019, the World Health Organization had reported that a number of people in Wuhan were being diagnosed with pneumonia from an unknown source. By 11 January 2020, China reported the first death due to the virus previously known as the novel coronavirus. Since its first detection in December 2019, the virus has spread and infected more than 241.9 million people in more than 218 countries around the world. Officially declared as a global pandemic by the World Health Organization (WHO) on 11 March 2020, the virus has killed more than 4.9 million people. The highest number of fatalities was recorded in the United States of America (USA) at 746,000, followed by Brazil at 603,000 and India at 452,000, as of October 2021 [14].
In Malaysia, the pandemic was first detected on 25 January 2020, involving three tourists from China who came to Malaysia via Johor Bharu from Singapore, marking the first wave of infections in Malaysia. The second wave generally began on 27 February 2020, with the number of confirmed cases having increased to more than 1000 in February 2020, leading to the announcement on the Movement Control Order (MCO) on 18 March 2020 to curb its spread. The enforcement of the MCO has led to a total closure of schools, universities, government offices, and private premises; a total ban of any mass gatherings for any religious, social, or cultural purposes; and a complete restriction for all inbound and outbound travel. Following a gradual decrease in the number of confirmed cases in Malaysia, especially in April 2020, the partial lockdown was further relaxed with the introduction of the Recovery Movement Control Order (RCMO) in June 2020. The third wave of the pandemic began after a sharp rise in the number of cases in September 2020, mainly due to the spread of infection from the Sabah prison cluster and Sabah state election held on 26 September 2020. To date, the number of cases in Malaysia has reached more than 2.4 million with 27,993 deaths as of 19 October 2021.
COVID-19 has had an enormous negative impact on the global tourism industry, mainly due to worldwide travel restrictions imposed to curb the spread of the pandemic. It has put a damper on the domestic tourism sector due to the enforcement of various lockdown measures and restrictions of inter-state travel. The United Nations World Tourism Organization (UNTWO) estimated a decline of more than 70% in international tourist arrivals in 2020, leading to a financial loss of more than USD 935 billion in export revenue. Asian and Pacific regions would be highly impacted with a decrease of more than 82% in international tourist arrivals, and this would be followed by the Middle East, Africa, and European regions by 73%, 69%, and 63%, respectively [15].
At a national level, the losses suffered by Malaysian tourism and culture industries in the first half of 2020 from the COVID-19 pandemic amounted to around USD 10.8 billion. Statistics released by the Department of Statistics Malaysia (DOSM) in April 2020 indicated a significant drop in the employment volume, at one percent, involving more than 14.93 million people over the same period last year. The existing workforce and supply chain of the tourism and hospitality industries are severely affected. Those affected include food and beverage, transportation, the arts, entertainment, and recreation [16].
For Langkawi, the dramatic decline in the overall number of inbound tourists to Malaysia has led to a significant drop in relevant statistical figures. The arrival of international tourists to Langkawi from its source markets has been reduced by more than 66%, compared to the previous year [5]. Tourism and hospitality industries in Langkawi were badly affected, with many hotels and hospitality businesses experiencing losses or shutting down completely.

Forecasting Models Used for Predicting Tourism Arrival
Tourist arrival trends across different source markets are amongst the most crucial information needed to plan and strategize any tourism agenda. For Langkawi, the information is even more critical in view of the current implementation of various initiatives under the Langkawi Blueprint, which serves as a catalyst towards the vision to list Langkawi among the Global Top 10 Island Destinations and Eco-Tourism Attractions in the world. To accelerate the process, the Blueprint of Langkawi 2016-2020 was launched with five key targets which, amongst others, have the objectives to (a) increase the number of tourists to Langkawi to more than five million and (b) increase tourism revenue from USD 910 million in 2015 to USD 2.15 billion in 2020 [17].
The tourism industry is one of the most vulnerable industries due to the influence of many internal and external factors [18,19] Hence, the accurate forecasting of tourist flow is essential in order to protect and preserve the sustainability and viability of the industry. Generally, there are two main forecasting approaches normally used in past studies, namely, time series and econometric models. The time series forecasting model is one of the most popular forecasting approaches among both tourism researchers and practitioners, due to its simplicity with the use of univariate data. The econometrics model, however, is often used for cross-sectional predictions of tourist flow by investigating the effect of independent variables on tourism flow, such as currency exchange rates or the incomes of potential tourists [20].
In previous studies, tourist arrivals have been forecasted using time series modeling techniques, e.g., Integrated Autoregressive Moving Averages (ARIMA), Simple Exponential Smoothing Methods, Holt's linear models, as well as Holt-Winters trends and seasonal models [21]. In past research, it was found that the Moving Average 10 (or MA (10)) model was the best forecasting model based on the smallest root mean square error (RMSE). Other researchers [22] used ARMA and AFRIMA models to conduct the time series modeling of tourist arrivals in Malaysia.
For Langkawi, Abdulsamad Yahya, Ruhaidah Samsudin, and Ani Shabri Ilman [23] used a new forecasting model by combining the Fourier residual modification with an optimized Grey model GM (1, 1) to forecast the tourist arrival trends in Langkawi. Using monthly tourist data, empirical results indicate that the proposed forecasting model demonstrates a superior performance compared to other methods, in terms of forecasting accuracy. In contrast, Mansor and Ishak [24] used ARIMA and AFRIMA models to forecast the tourist arrival trend for Langkawi, while Nur Fatihah Fauzi, Nurul Shahiera Ahmad, Nor Hayati Shafii, and Huda Zuhrah Ab. Halim [25] used fuzzy time series and Holt-Winters models for forecasting tourist arrivals in Langkawi. Kedah. Nur Intan Liyana Mohd Azmi [26] also used parameter estimations of the Holt-Winters smoothing method, using genetic algorithms to predict tourist arrivals to Langkawi. Clearly, from the above discussion, ARIMA and Holt-Winters smoothing methods were used to forecast tourist arrivals, especially for Langkawi. The same forecasting models have been used in many other studies related to tourism forecasting [21,27].
Despite their wide usage in the present literature, Abdul Samad Yahya, Ruhaidah Samsudin, and Ani Shabri Ilman addressed some limitations in ARIMA and artificial neural networks, such as that their forecasting performance is often inconsistent and requires complex calculations [23]. However, ARIMA and Holt-Winters smoothing methods have been successfully used in the past for forecasting nonlinear, cyclic, and seasonal data, such as energy consumption and tourist arrivals [28]. Hence, the same methods were considered appropriate for tourist arrival data with trendy and seasonal variation patterns, as is evident in past literatures.
It is important to note that past studies failed to specifically forecast the arrival trends for the source countries and reflect on those findings in the post-pandemic era. In the context of Langkawi as an emerging tourism island, it is important to conduct a forecasting analysis for the top source countries, and not for the overall international tourist arrival, to enable accurate targeting and planning for the specific source countries. To the best of our knowledge, no such studies have been performed before for Langkawi. Hence, the present study aims to fill the void by providing the forecasting trend of tourist arrivals to Langkawi, Malaysia from its top three source markets, namely, China, Saudi Arabia, and the United Kingdom, between 2020 and 2022. Using the annual gross domestic product (GDP) growth of the three countries, the study seeks to investigate whether changes in GDP would have any significant impact on tourist arrivals from these countries to Langkawi in the post-pandemic era.

Research Method and Data Set
The present study used secondary data in achieving the objectives of the study. Currently, the tourist arrival secondary data were collected from Tourism Malaysia and the Langkawi Development Authority, while the annual GDP growth data on China, Saudi Arabia, and the United Kingdom were collected from the World Bank data website. The data for this study comprised of secondary yearly data from 2003-2019. For the purpose of this study, the annual GDP growth for the three countries was extracted from the World Bank portal [14]. There are several types of GDP, such as GDP per capita, nominal GDP, and real GDP, but in the present study, data on GDP growth in percentages from 2003-2019 for the three countries was extracted from the website.
In the present study, "tourist" is defined as "a person in the blank space, outside of his/her residence, who spends at least one night in a hotel or other facility for the accommodation of guests, for the determination of resting, recreation, health, study, sports, religious belief, family, public affairs missions, and conferences" [15]. The United Nations World Tourism Organization [15] differentiates the concept of a tourist from a visitor. A visitor is defined as a traveler taking a trip to a main destination outside his/her usual environment, for less than a year, for any main purpose (business, leisure, or other personal purpose) other than to be employed by a resident entity in the country or place visited. A traveler is classified as a tourist if his/her trip includes an overnight stay [29].

Data Analysis
This research studied tourist arrivals from top source markets to Langkawi, namely, China, Saudi Arabia, and the United Kingdom, using both ARIMA models and Holt's linear model. The time series analyses were conducted using the IBM Statistical Package for Social Sciences, version 26, to test the null hypotheses that the tourist arrival data series is stationary from 2003-2019 for China, Saudi Arabia, and the UK. Specifically, the study used an expert modeler to find the best fit model to forecast tourist arrivals from these three countries. Then, the study conducted linear regression analysis to find out whether there is any significant relationship between the annual GDP growth of China, Saudi Arabia, and the United Kingdom, and the number of inbound tourists from those three countries to Langkawi.
The first step of this research was to explore the tourist arrival in Langkawi from China, Saudi Arabia, and the United Kingdom, and then to forecast the estimated tourist arrivals for the years 2020-2022. The second step was conducted to establish a relationship between tourist arrivals from China, Saudi Arabia, and the United Kingdom with the annual GDP growth of their country of origin to study whether changes in GDP would have any significant impact on tourist arrivals from these countries to Langkawi.
It is vital to ascertain the relationship between tourist arrivals from China, Saudi Arabia and the United Kingdom and their annual growth in GDP because the presence of COVID-19 from early 2020 has affected the GDP of many countries. Thus, if there exists any link between tourist arrivals from China, Saudi Arabia, and the United Kingdom and their respective GDP growth, then Langkawi's tourist demand from these countries will be significantly impacted if there are any changes in the GDP of these countries.
To forecast tourist arrivals from China and Saudi Arabia in Langkawi, the best fitted model was found to be the Holt linear model, which is the smoothest form of exponential smoothing. The formula for this model is given below: where α is the smoothing factor at 0 ≤ α ≤ 1. This means St is a simple weighed average of the current observation and the previous smoothed statistic, St-1. This equation generates a smoothed statistic when these two observations are available. This forecasting model was chosen to forecast the data of Chinese and Saudi Arabian tourists because it had the lowest mean absolute error (MAE), root mean square error (RMSE), and mean absolute percentage error (MAPE), as assessed by the expert modeler tool of SPSS. The ARIMA model is used to forecast time series by separating the signal from the noise so that the signal can be extrapolated into the future to generate forecasts. For stationary time series, the ARIMA forecasting equation, a linear equation in which the predictors are based on the lags of the dependent variable, is used. To forecast the arrival of tourists from the UK in Langkawi, the best fitted model was found to be ARIMA (0,0,0). The ARIMA process with zero mean and stationary data (p, q) is defined by sequencing random variables {Xt}. The equation is: To establish the relationship between the tourist arrivals from China, Saudi Arabia, and the United Kingdom and these countries' GDP growth, linear regression analysis was used. To find whether Chinese tourist arrivals to Langkawi are affected by the annual GDP growth of the origin country, the equation is: where: y = Tourist arrivals from China to Langkawi; xi = Annual GDP growth of China; α = α is the y-intercept or constant in the equation; and β = β is the slope of the equation, which is also known as the regression coefficient.
To find whether Saudi Arabian tourist arrivals to Langkawi are affected by the annual GDP growth of the origin country, the equation is: where: y = Tourist arrivals from Saudi Arabia to Langkawi; xii = Annual GDP growth of Saudi Arabia; α = α is the y-intercept or constant in the equation; and β = β is the slope of the equation, which is also known as the regression coefficient.
To find whether the United Kingdom's tourist arrivals to Langkawi are affected by the annual GDP growth of the origin country, the equation is: where: y = Tourist arrivals from UK to Langkawi; xiii = Annual GDP growth of UK; α = α is the y-intercept or constant in the equation; and β = β is the slope of the equation, which is also known as the regression coefficient.

Results
This research is driven by an interest to forecast tourist arrival trends to Langkawi, Malaysia from its top three source markets, namely, China, Saudi Arabia, and the United Kingdom, between 2020 and 2022, and to investigate whether GDP trends have any significant impact on tourist arrivals from these countries in the context of post-COVID-19 scenarios. Table 1 shows the number of tourist arrivals from China, Saudi Arabia, and the United Kingdom from 2003-2019. It reflects that China was the top source market to Langkawi, with high growth in recent years, followed by Saudi Arabia and the United Kingdom, as seen in Figure 1 as well. The study analyzed yearly data from 2003-2019 on tourist arrivals from China to Langkawi, finding that the tourists had a healthy growth, from 5340 in 2003 to 292,046 in 2019, with the highest peak being 375,903 in 2018. The Holt linear model was used to forecast tourist arrivals from 2020-2022. In Table 2, the number of forecasted tourist arrivals from the top three source markets from 2020-2022 can be seen. With the present study, conducted in mid-2020, the forecasted results, especially for the 2020 data, is considered valid at that point in time of the data analysis.     This study was conducted to analyze the data and conduct forecasting using the best fit time series model. To assess the forecasting performance of the data, RMSE, MAE, and MAPE were used with the smallest values taken, as shown in Table 3. The model accuracy was also highlighted by the R-square for each country's tourist arrivals. The R-square for Chinese tourists to Langkawi is 0.848, which means 84.8% of the forecasted tourist arrivals from China can be based on its yearly data. The R-square for Saudi Arabian tourists to Langkawi is 0.916, which means 91.6% of the forecasted tourist arrivals from Saudi Arabia can be based on its yearly data. The R-square for the United Kingdom's tourists to Langkawi is 0.834, which means 83.4% of the forecasted tourist arrivals from the United Kingdom can be based on its yearly data. According to the Holt's linear model for China and Saudi Arabia and the ARIMA (0,0,0) model for the United Kingdom, the estimated forecasted tourist arrivals to Langkawi in 2020 are shown in Table 4, with a 95% confidence level. Table 4 shows that tourist arrivals from China, Saudi Arabia, and the United Kingdom are estimated to increase to 359,358, 170,227, and 97,431, respectively, in 2020.
However, the next part of this study will shed more light on the precision of these values, because if GDP has a significant relationship to the tourist arrivals of these countries, then a change in GDP will, in turn, impact the number of tourist arrivals from these countries. To predict the effect of GDP on tourist arrivals from the top three source countries, linear regression was conducted. However, according to McGuirk, Driscoll, and Alwang [30], it is important to conduct a misspecification test before conducting the linear regression analysis. A significant misspecification suggests that the research has biased coefficients and error terms with a tendency towards biased parameter estimations. To ensure that the research conducted does not have any misspecification, heteroscedasticity analysis using a Breusch-Pagan test can be conducted. This will ensure that the regression model has homoscedasticity and therefore does not present any heteroscedasticity. The Breusch-Pagan test [31] was conducted to determine whether heteroscedasticity is present in this research model or not. The test used null and alternative hypotheses:

Null Hypothesis (H0): Homoscedasticity is present in the regression model (the residuals are distributed with equal variance); Alternative Hypothesis (HA): Heteroscedasticity is present (the residuals are not distributed with equal variance).
To conduct the Breusch-Pagan test, the following steps were taken: 1. Linear regression was conducted between dependent and independent variables; 2. Unstandardized predicted and residual values were recorded; 3. Unstandardized residual value was squared to conduct the Breusch-Pagan test; 4. Linear regression was again performed using unstandardized residual values as the dependent variable (separately for China, Saudi Arabia, and the UK) and independent variable (separately for the GDP of China, the GDP of Saudi Arabia, and the GDP of the UK); 5. The output of significance (P-value) was analyzed to see whether heteroscedasticity is present in the regression models or not. Table 5 shows that the p-value of the test is 0.555 (>0.05). Therefore, the null hypothesis of the data fails to reject that homoscedasticity is present in the regression model. This means the data for this linear regression model is free from misspecification.  Table 6, below, shows that the p-value of the test is 0.84 (>0.05). Therefore, the null hypothesis of the data fails to reject that homoscedasticity is present in the regression model. This means the data for this linear regression model is free from misspecification.  Table 7, below, shows that the p-value of the test is 0.246 (>0.05). Therefore, the null hypothesis of the data fails to reject that homoscedasticity is present in the regression model. This means the data for this linear regression model is free from misspecification. Following the results of the misspecification test, this research conducted a linear regression analysis to establish the relationship between tourist arrivals from China, Saudi Arabia, and the United Kingdom and their annual GDP growth. Tables 8-10, below, show the significance levels and standard betas of each country. According to the result output, China's annual GDP growth (β = 0.757, p < 0.05) and Saudi Arabia's annual GDP growth (β = 0.500, p < 0.05) have a significant positive relationship to the tourist arrivals from these countries to Langkawi. However, the United Kingdom's annual GDP growth (β = 0.030, p > 0.05) does not have a significant relationship to the tourist arrivals from the United Kingdom to Langkawi. This means that GDP growth can impact tourist arrivals from China and Saudi Arabia but it will not have any significant effect on tourist arrivals from the United Kingdom.
A β coefficient value indicates the contribution of a variable in predicting the dependent variable. A significant β coefficient indicates a statistically significant relationship between the variables. The coefficient ranges from 0-1; the higher the value of the beta, the stronger the contribution of the variable to the dependent variables [32]. In the present study, significant β coefficient values for China and Saudi Arabia indicate that the annual GDP growth of the two countries have a significant positive relationship to the tourist arrival trend to Langkawi.

Equation:
Tourist arrivals from China = 0.757 annual GDP growth of China Table 9. Linear regression analysis output between Saudi Arabian tourist arrivals to Langkawi and the annual GDP growth of Saudi Arabia.

Equation:
Tourist arrivals from Saudi Arabia = 0.500 annual GDP growth of Saudi Arabia Table 10. Linear regression analysis output between the United Kingdom's tourist arrivals to Langkawi and the annual GDP growth of the United Kingdom.

Equation:
Tourist arrivals from United Kingdom = 0.030 annual GDP growth of the United Kingdom

Discussion
This study is the first study to forecast on tourist arrival trends to Langkawi by focusing on Langkawi's top source markets, namely, China, Saudi Arabia, and the UK, before delving further to explore whether changes in the annual GDP growth of the said countries would influence the trend.
Using an expert modeler, the present study has predicted the number of tourist arrivals from China, Saudi Arabia, and the UK to Langkawi from 2020-2022. Generally, we can conclude that, without COVID-19, Langkawi would have seen an increasing trend in tourist arrivals, by 14% in 2021 and 12.3% in 2022, from China. Tourists from Saudi Arabia will increase by 5.6% in 2021 and 5.3% in 2022. However, no changes in tourist arrival trend can be discerned for tourists from the United Kingdom for the next two years.
To predict the impact of GDP on tourist arrivals, the present research conducted a linear regression analysis to establish the relationship between tourist arrivals in China, Saudi Arabia, and the United Kingdom to their annual GDP Growth. The results further showed that changes in GDP will impact tourist arrivals from China and Saudi Arabia but will not have any significant effect on tourist arrivals from the United Kingdom. This finding, in particular, has an important implication to the tourism development of Langkawi in the post-pandemic era. With the GDP of China and Saudi Arabia playing a significant role in the inbound tourist arrivals of their citizens to Langkawi, it is predicted that the number of tourists from the two countries will be negatively affected, especially during the post-pandemic era. In other words, the GDP is predicted to be more significant upon the Chinese and Saudi Arabian markets, as compared to the UK market, which has been on a static trend. It is believed that lower GDPs during the post-pandemic era will cause a negative influence on the total number of inbound tourist arrivals from China and Saudi Arabia to Langkawi. However, it will not register any adverse impact on tourist arrivals from the United Kingdom.
This finding has a strong implication on the post-recovery period of the pandemic. With data of the linear regression analysis showing the strong influence of annual GDP growth on tourist arrivals to Langkawi, especially for countries like China and Saudi Arabia, it is expected that the post-COVID-19 tourism recovery period will be longer for these two countries, compared to the UK. In other words, for Langkawi, the UK market will recover faster and is more resilient than the other two countries due to a lesser reliance on GDP for tourism growth. Evidence of the dependent structure in GDP and tourism growth rates have been documented in many studies [33,34].
GDP indicates the size of a country's economy calculated by the total dollar value of all goods and services produced by an economy over a specific time period. GDP growth implies the health of a country's economy. Compared to China and Saudi Arabia, the UK is less dependent on tourism, which contributes about 9.3% to its GDP, while China is 11.3% and Saudi Arabia is 9.5% [35]. With COVID-19 ravaging the travel and tourism industries in many countries, severe economic impacts can be observed, especially among the countries most dependent on the travel and tourism industries for their economic growth, such as China and Saudi Arabia. However, the opposite is forecasted for the UK, due to its lower reliance on the tourism industry for its overall GDP growth. In other words, a speedy rate of recovery in the number of tourists from the UK to Langkawi is forecasted once international travel restrictions are lifted, as the world eases into the postpandemic period.

Conclusions
The present forecasting models deliver the predicted number of tourist arrivals from 2020-2022, which was plotted without taking into account the adverse impact wreaked by the COVID-19 pandemic. Generally, we can conclude that without COVID-19, Langkawi would have recorded a steady trend in tourist arrivals from China and Saudi Arabia. However, no changes in tourist arrival trends will be observed for tourists from the United Kingdom for the next two years. The impact of COVID-19 is predicted to be more significant for both the Chinese and Saudi Arabian markets, in sharp contrast to the UK market.

Implications for Society
This study is timely, as we are in a transition period towards post-pandemic recovery. Recent announcements on mass vaccine rollouts in many countries, and the COVID-19 national vaccination plan for all Malaysians, have provided some solace, spurring hope that the pandemic's end is in sight. As we advance towards the post-pandemic phase, the results of this study will help countries, including Malaysia, to better predict the impact of GDP upon the tourism industry to establish appropriate tourism policies in order to be better-prepared in the future. Findings can assist both governmental, non-governmental, and private agencies in the development of bounce-forward strategies, rather than the bounce-back notions that have often been practiced in the past. The bounce-forward strategies would involve the complete realization that the risk of COVID-19 will continue to be part of our lives. Hence, this requires a total re-evaluation of the current social systems, social practices, business models, and systems of operation [36].

Implications for Industry
Specifically for Langkawi, this study identified the impacts of GDP on inbound international tourists from its top source markets, and found evidence of the impact on different source countries. To make up for the loss due to the significant reduction of inbound international tourists, Langkawi can focus on enhancing domestic arrivals. The future plan should focus on expanding tourist attractions to wider geographical areas, which is achievable by promoting recreational, underwater, and nautical activities, such as sailing and fishing, to reduce the concentration of tourists at any one time in a particular geographical area. By allaying lingering fears among tourists, it is necessary to develop more effective management protocols before and during a crisis to ensure the safety and health of all, by ensuring that standard operating procedures (SOPs) are adhered to. Advanced technologies, such as artificial intelligence (AI), and social distancing measurements and warning systems should be considered to detect density of and distance among people in public areas such as beaches, shopping malls, and airports [37].
The findings of the present study would benefit many tourism stakeholders, especially the Langkawi Development Authority, which is the main government agency responsible for the tourism development and growth of the island. Being the least tourismdependent country, the UK will quickly recover from the impact of the pandemic. The country is also projected to be the fastest-growing G7 country in 2022, surpassing the US, Japan, Germany, France, Italy, and Canada [38]. The UK's GDP is expected to increase by 6.8% in 2021, compared to Saudi Arabia at 2.8%. China, despite showing good a GDP forecast at 8% for the year 2021 [39], is imposing a longer halt to its outbound travel for the next 1-2 years, due to various restrictions imposed by the government [40]. With findings describing the minimal impact of GDP upon the UK's economy, a more strategized campaign should be targeted at and planned for this specific market, especially during the post-pandemic era.

Limitations of the Study
Despite the valuable findings, it is also important to address some limitations of the present study. Firstly, it is limited by the available annual dataset on tourist arrivals to Langkawi from three source countries, namely, China, Saudi Arabia, and the UK. Monthly and quarterly data are only available for the overall international tourist arrivals. The forecasting of international tourist arrivals has been conducted by many previous researchers. To add value, the present study forecasts tourist arrivals from the top three source countries for Langkawi. However, only yearly data is available for this, due to different datarecording systems used by the agencies responsible. For Langkawi, the systematic recording of tourist arrival data only began in 2003, leaving us with data points for only 17 years until 2019, which may limit its predictive power. While it is well-understood that power increases along with the number of data points, "there are no specific limits regarding the number of data points, as the power depends on various other factors, including distribution of data points, variability within the data, strength of effect, and the presence of confounding effects such as seasonality" (pg. 350). Studies with few time points, however, should be interpreted with care [41].
A second limitation pertains to the use of univariate time series models in generating the prediction model with data on GDP growth that was analyzed separately using linear regression analysis. Future research should consider utilizing multivariate analysis to obtain more a precise understanding of tourist arrival trends for Langkawi from its main source markets. With the pandemic impacting the tourism industry, it is also important to incorporate other economic factors, such as the currency rate, or sustainability factors, such as environmental pollution, into the forecasting model. The possible spurious results and degrees of freedom should be further tested in the next study [8].
Notwithstanding these limitations, the present study is the first study to specifically forecast tourist arrivals for the top three source countries to Langkawi. Using the annual gross domestic product (GDP) growth of the said three countries, the present study is also novel and timely, as it empirically measures the effect of GDP upon the tourist arrivals trend, using GDP growth as the basis of analysis in order to reflect on the findings in the context of the post-pandemic era.
Author Contributions: Conceptualization, methodology, writing-original draft preparation, writing-review and editing, and funding acquisition was completed by H.M.; software, data curation, data validation, and data analysis was completed by F.A.; data acquisition and data validation was completed by W.W.Z.; final editing and formatting was completed by A.M.E. All authors have read and agreed to the published version of the manuscript.