Summary: | This study has two research objectives: (1) to find evidence whether investment decisions (allocation of funds in each asset in a portfolio) of Indonesian investors in the short investment horizon diverge with their investment decisions in the long investment horizon, and (2) to examine the belief of Indonesian investors in the mean reversion. This study analyzes the investment horizon from a behavioral point of view by examining the influence of investment horizon on investment decision and mean reversion in Indonesia. We employed the students of Master of Science, Master of Management, and Doctorate Programs at the Faculty of Economics and Business, Universitas Gadjah Mada, Indonesia as the sample in this research. Of the 217 questionnaires delivered, 172 questionnaires were completely filled and utilized in this study. The main findings of this study are as follows: (1) it is significantly proved that Indonesian investors are inclined to assume higher portfolio risk in the longer investment horizon than that in the shorter investment horizon
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