http://www.mdpi.com/journal/economies Latest open access articles published in Economies at http://www.mdpi.com/journal/economies http://www.mdpi.com/2227-7099/1/1/6 We study whether forecasts of the rate of change of the price of oil are rational. To this end, we consider a model that allows the shape of forecasters’ loss function to be studied. The shape of forecasters’ loss function may be consistent with a symmetric or an asymmetric loss function. We find that an asymmetric loss function often (but not always) makes forecasts look rational, and we also report that forecast rationality may have changed over time. Economies 2013-03-27 1 1 Communication 10.3390/economies1010006 6 13 2227-7099 2013-03-27 doi: 10.3390/economies1010006 Christian Pierdzioch Jan-Christoph Rülke http://www.mdpi.com/2227-7099/1/1/3 Economies (ISSN 2227-7099) is a new international, peer-reviewed open access journal for the academic fields of development economics and macroeconomics. While the latter seems to be clearly defined, development economics is not, because it is related to nearly all traditional economic sub-disciplines such as macroeconomics, international trade and finance, as well as microeconomics and public finance. Typically, academic field journals of development economics cover all those economic sub-disciplines. Economies instead focuses mainly on the macroeconomic perspective of economic development and it intends to publish academic research that is of strong macroeconomic policy relevance. In general, contributions in Economies should foster understanding of the macroeconomic process of economic development, with the process of development not exclusively being reserved to what we typically call developing countries. Also, the group of developed economies is still developing in the sense of improving their living standards further. Economies 2013-01-17 1 1 Editorial 10.3390/economies1010003 3 5 2227-7099 2013-01-17 doi: 10.3390/economies1010003 Ralf Fendel http://www.mdpi.com/2227-7099/1/1/1 The motivation for launching the journal Economies (ISSN 2227-7099) is my concern regarding human sustainability [1,2]. There are two major categories of economic systems: capitalism, or free market economy and socialism, or planned economy. The last 30 years have witnessed great social change in China, for example, indicating that the free market economy has prevailed and now dominates around the World. Economies 2013-01-15 1 1 Editorial 10.3390/economies1010001 1 2 2227-7099 2013-01-15 doi: 10.3390/economies1010001 Shu-Kun Lin