3.1. Equilibrium Point Calculation
In order to find the equilibrium points of the student–club game system, all of the equilibrium points can be found according to the concept of the evolutionary stability strategy and the knowledge of differential equations:
Regardless of the value of the payment variables M, R, N, and S, there are four sets of definite solutions for the second-order differential equations of (0,0), (0,1), (1,0), and (1,1). When M < R and N < S, there is another set for a possible solution (K/(K + S − N),J/(J + R − M)).
The solution of the above situation is the equilibrium points of the student–club game system, and whether they are stable points or not needs to also be judged.
The Jacobian matrix of the student–club game system is
In order to analyze the stability of the equilibrium points, the possible equilibrium points were substituted into the Jacobian matrix, and the determinant and trace of the Jacobian matrix that corresponded to the different equilibrium points were calculated, as shown in
Table 4.
3.2. Equilibrium Points Stability Analysis
If the determinant of the matrix is greater than 0 and the trace of the matrix is less than 0, then the system is in a steady state at that equilibrium point. At the same time, the values of the determinant and the trace of the matrix are related to the loss variables of each participating individual in the two groups. For the same equilibrium point, the value of the loss variable was different, the values of the determinant and trace of the Jacobian matrix were different, and the type of equilibrium point was also different. Therefore, considering the different values of the loss variables, we can judge the types of the equilibrium points in various cases, and we can also analyze the process and results of the evolutionary game, as shown in
Table 5.
The factors that determine the determinant and the trace of the matrix are, in the main matrix, the size of the variables M and R, as well as N and S in the game matrix. Considering that the sizes of M and R are mainly M < R or M > R and that the sizes of N and S are mainly N < S or N > S, then we can combine them into four cases to discuss the types of equilibrium points in the different cases.
First of all, we briefly discuss the practical significance of the four situations in which M and R, as well as N and S, are combined.
From the perspective of the clubs, if a club actively organizes activities when the number of students involved is small, then it will result in a waste of resources to a certain extent. Conversely, if there is lack of activities being organized by a club, then it will reduce the unnecessary loss to a certain extent and the investment loss would be greater than the chance loss, thus indicating N < S.
From the perspective of the clubs, if a club actively organize activities when the number of students involved is large, then it will meet the needs of students to a certain extent. Conversely, if there is a lack of activities being organized by a club, then it will result in student dissatisfaction with the club and, to a certain extent, it will increase unnecessary loss, which means that the investment loss would be less than the chance loss, thus indicating N > S.
From the perspective of the students, if students are actively participating in activities when there are fewer activities being organized by a club, then it will decrease student enthusiasm and interest to a certain extent due to the more passive organization. If there is a lack of students participating in activities, then it will reduce unnecessary loss to a certain extent and the investment loss would be greater than the chance loss, thus indicating M < R.
From the perspective of students, if students are actively participating when there are more activities being organized by a club, then they can choose more activities, which will stimulate student interest to a certain extent. Conversely, if there is a lack of students participating in activities, then their own development would be mitigated to a certain extent and the investment loss would be less than the chance loss, thus indicating M > R.
The following discussion focuses on the stability of equilibrium points in the context of four different categorization criteria.
3.2.1. M < R and N < S
As shown in
Table 6, the chance loss for both students and clubs was found to be lower than their respective investment losses.
As shown in
Table 6, it can be seen that the chance loss was found to be less than the investment loss for both the students and clubs, which led to the emergence of five equilibrium points within the system. There existed two ESS points—(0,1) and (1,0)—and two unstable points—(1,1) and (0,0)—in the system, with an equilibrium point—(
K/(
K +
S −
N),
J/(
J +
R −
M))—serving as the center point. In other words, when the students passively participate in club activities and the clubs passively organize club activities, then the system cannot have a stable point. This aspect is not discussed further below.
A set of values with J = 1, R = 6, M = 4, K = 2, S = 8, and N = 4 that satisfied the current conditions (M < R and N < S) were utilized. The evolutionary path of the student–club game system was plotted under different initial (x,y) values, where x and y were selected from the vector [0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1]. The evolutionary path was then analyzed accordingly.
By taking the evolutionary path with the initial values of (0.6, 0.9) as a representative value through which to analyze
Figure 1, the evolutionary direction was clearly identified. At this point, both the students and the clubs exhibited relatively high levels of enthusiasm for participation in club activities. With respect to the students, when a club actively organizes club activities and if the students find that the “investment loss,
R” is greater than the “chance loss,
M” (
M < R), then they will be more inclined to passively participate in club activities that reduce their loss in this situation, thus leading to a decrease in their engagement in club activities. With respect to clubs, when students actively participate in club activities, then a club may find that the “investment loss,
S” is greater than the “chance loss,
N” (
N < S). In this situation, a club would be more inclined to passively organize club activities so as to reduce their loss, thus leading to a decrease in their engagement in organizing activities. At position (
x,
y) = (0.35, 0.85), the enthusiasm of students with respect to participating in club activities was found to be low, but the enthusiasm of clubs in terms of organizing club activities remained relatively elevated.
With respect to students, when a club exhibits a high level of enthusiasm in organizing club activities and if the students continue increasing their engagement, then they will discover that the “investment loss, R” is greater than the “chance loss, M” (M < R). Therefore, students tend to decrease their engagement in club activities so as to reduce loss. Regarding clubs, the engagement of students in club activities would already be low in this situation. If a club further decreases its enthusiasm for organizing club activities, then it would incur a “development loss, K”. Therefore, such a club would be inclined to increase its enthusiasm in organizing club activities so as to avoid development loss. The final evolutionary process converged toward (0,1), thus indicating that, regardless of how actively the clubs organized club activities, the students did not take part.
3.2.2. M < R and N > S
When the chance loss is smaller than the investment loss for students and the chance loss is greater than the investment loss for clubs, then the system has the following four equilibrium points: (0,0), (0,1), (1,0), and (1,1). The stability of each equilibrium point is shown in
Table 7.
A set of values with
J = 1,
R = 6,
M = 4,
K = 2,
S = 4, and
N = 8 that satisfied the current conditions (
M < R and
N > S) were used and the evolutionary path was shown in
Figure 2. The evolutionary path of the student–club game system in these current conditions was plotted under different initial (
x,
y) values, and its evolutionary patterns will be discussed in the following section.
With respect to the students, when a club passively organizes activities, then the students may find that reducing their levels of participation in such activities will result in an additional “development loss, J”. Therefore, students tend to increase their level of participation in order to avoid this additional loss. However, when a club actively organizes activities, then students may find that the “investment loss, R” is more important than the “chance loss, M” (M < R). In this case, students are more likely to reduce their level of participation in order to minimize their loss. As such, the enthusiasm of students with respect to participating in club activities will decrease.
Regarding clubs, when students passively participate in club activities, a club may find that reducing their level of enthusiasm in organizing such activities will result in an additional “development loss, K”. However, when students actively participate in club activities, then a club may find that the “investment loss, S” is smaller than the “chance loss, N” (N > S). Therefore, regardless of the enthusiasm of students with respect to participating in club activities, a club would be more inclined to reduce its loss through actively organizing club activities. As a result, the level of enthusiasm in organizing club activities by a club will also increase.
In conclusion, the system exhibits the ESS point (0,1) during its evolutionary process, whereby the students passively participate in club activities while a club actively organizes activities.
3.2.3. M > R and N < S
When the chance loss is greater than the investment loss for students and the chance loss is smaller than the investment loss for clubs, the system has the following four equilibrium points: (0,0), (0,1), (1,0), and (1,1). The stability of each equilibrium point is shown in
Table 8.
At this point, one stable point (1,0) and two saddle points (0,1), (1,1) were observed in the student–club game system. Subsequently, a set of values with
J = 1,
R = 4,
M = 6,
K = 2,
S = 8, and
N = 4 that satisfied the current conditions (
M > R and
N < S) were used and the evolutionary path was shown in
Figure 3. The evolutionary path of the system in these current conditions was plotted under different initial (
x,
y) values, and its evolutionary patterns are discussed in the following section.
Regarding students, when a club passively organizes activities, the students may find that reducing their levels of participation in such activities will result in an additional “development loss, J”. However, when a club actively organizes club activities, then students may find that the “investment loss, R” is smaller than the “chance loss, M” (M > R). Therefore, regardless of the level of enthusiasm shown by a club in organizing club activities, students will be more inclined to take an active part in order to minimize their loss. As a result, the levels of participation and enthusiasm for students in club activities will increase.
With respect to clubs, when students passively participate in club activities, a club may find that reducing their level of enthusiasm in organizing such activities will result in an additional “development loss, K”. Therefore, clubs may still prefer enhancing their enthusiasm in organizing club activities so as to reduce loss. However, when students actively participate in club activities, a club may find that the “investment loss, S” is greater than the “chance loss, N” (N < S). In this situation, a club would be more inclined to passively organize club activities in order to reduce its loss, thus leading to a decrease in its engagement in organizing activities.
In conclusion, the system exhibited the ESS point (1,0) during its evolutionary process, which is when students actively participate in club activities while a club passively organizes activities.
3.2.4. M > R and N > S
When the chance loss for both students and clubs is greater than their respective investment loss, the system has the following four equilibrium points: (0,0), (0,1), (1,0), and (1,1). The stability of each equilibrium point is shown in
Table 9.
At this point, one stable point (1,1) and two saddle points (0,1), (1,1) were observed in the student–club game system. Subsequently, a set of values with
J = 1,
R = 4,
M = 6,
K = 2,
S = 4, and
N = 8 that satisfied the current conditions (
M > R and
N > S) were used and the evolutionary path was shown in
Figure 4. The evolutionary path of the student–club game system in the current conditions was plotted under different initial (
x,
y) values, and its evolutionary patterns are discussed in the following section.
With respect to students, when a club passively organizes activities, the students may find that reducing their levels of participation in such activities will result in an additional “development loss, J”. However, when a club actively organizes club activities, students find that the “investment loss, R” is smaller than the “chance loss, M” (M > R). Therefore, regardless of the level of enthusiasm shown by a club in organizing club activities, students are more inclined to actively participate in order to minimize their loss. As a result, the levels of participation and enthusiasm for students in club activities will increase.
Regarding clubs, when students passively participate in club activities, a club may find that reducing its level of enthusiasm in organizing such activities will result in an additional “development loss, K”. However, when students actively participate in club activities, a club may find that the “investment loss, S” is smaller than the “chance loss, N” (N > S). Therefore, regardless of the enthusiasm of students in participating in club activities, a club would be more inclined to reduce its loss through actively organizing club activities. As a result, the level of enthusiasm in organizing club activities by the clubs will also increase.
In conclusion, the system exhibited the ESS point (1,1) during its evolutionary process, which is when students actively participate in club activities and clubs actively organize activities.
3.3. Experiment Analysis
We collected data on the club organizations and student participation of Yanshan University from 2018 to 2022. The following verify the effectiveness of the model through actual statistical data. In fact, only the relative size relationships between M and R as well as N and S need to be quantified, and the resulting trend is the same as the convergence trend in the model. However, in practice, it is difficult to match the parameters; as such, we quantified the relative size of the parameters via questionnaires.
We researched a total of nine club-related types of information and numbered each club, using C1, C2, C3,..., C9, etc., to represent the names of the clubs. We quantified the student enthusiasm through the number of students participating in the clubs. At the same time, we quantified the enthusiasm of the clubs through the funds invested. Moreover, we further verified the effectiveness of the model through the relevant information of these nine clubs. For the sake of illustration and verification, we grouped C1–C3, C4–C6, and C7–C9 together when the convergence trend of these groups was the same as that of the theoretical model, and this group was represented separately during the simulation.
As shown in
Figure 5 and
Figure 6, the enthusiasm of students and clubs showed an upward trend, which is consistent with the trend of the above model converging to (1,1). The reason for this was that the chance loss of students and clubs is greater than the investment loss. In other words, students can reasonably control their spare time and their development will not be affected by participating in clubs, which helps with promoting the enthusiasm for the organizing of activities by clubs. While its exposure is guaranteed, a club should also have sufficient funds to hold activities; thus, this should promote student enthusiasm for participation in clubs. As a result, student and club motivation would be on the rise.
The students’ enthusiasm showed a downward trend and the clubs’ enthusiasm showed an upward trend, as shown in
Figure 7 and
Figure 8, respectively. This is consistent with the trend of the above model converging to (0,1). The reason for this is that, if students find they are wasting their time by participating in club activities, then their enthusiasm will decrease. However, if a club reduces its organizational enthusiasm, then it will hinder its own development; thus, such a club would likely increase its organizational enthusiasm. If this is the case, the enthusiasm of students will decrease and the enthusiasm of clubs will increase.
The students’ enthusiasm showed an upward trend and the clubs’ enthusiasm showed a downward trend, as shown in
Figure 9 and
Figure 10, respectively. This is consistent with the trend of the above model, which converged to (1,0). The reason for this was that students can reasonably allocate their time to participate in activities. However, a club may have to reduce the number of activities it organizes due to funding issues and, thus, would be in a state of passive organization. In such a case, students would still actively participate in order to encourage the club to organize more activities later and thus improve the enthusiasm for the club to organize more activities in the future. As a result, the student motivation would increase while the club motivation would decrease.