سابقه و هدف: آب هوای یک منطقه در دوره بلندمدت را اقلیم گویند. شناسایی طبقه‌بندی اقلیمی از دیرباز مورد توجه متخصصان هواشناسی بوده است. محققان با به کارگیری روش ­های مختلف استفاده متغیرهای همچون بارش دما، زمین مناطق همگن طبقه ­بندی کرده‌اند نتایج پهنه‌بندی ارزیابی کمبود منابع مقیاس­ های کوچک بزرگ منظور پیش‌بینی اقدامات عملی برای کنترل خشکی آسیب‌پذیر به‌کار برده‌اند. هدف این تحقیق به‌‌روزرسانی تحل...

We examine experimentally how a person’s generosity depends on the degree of anonymity between giver and recipient, as well as on the parties’ sexes. Less is given when the giver is paid on stage rather than in private; men receive less than women; fewer men than women give non-zero amounts. The results suggest that it may be problematic to organize experimental data in terms of social distance...

The paper examines the rise fall and rise of the Liberal International Economic Order over the last 150 years, and critically examines the various hopes and fears in developed and developing countries that this most recent global integration is raising. JEL classification: F02, A13, N70, P16. Address: Dept. of Economics, UCLA, 405 Hilgard Ave., Los Angeles, CA 90024 Tel.: 310-825 4521 Fax.: 310...

We develop an evolutionary approach to explain altruistic preferences. Given their preferences, individuals interact rationally with each other. By comparing the success of players with different preferences, we investigate whether evolution favors altruistic or selfish attitudes. The outcome depends on whether the individuals' interactions are strategic complements or substitutes. Altruism and...

Our research is a variant of the third party punishment game. In particular, we want to test whether players have heterogeneous preferences; the levels of the sanction and of the transfer are proportional to the unfairness of the Dictator; the change of the role influences the Observer’s reaction to unfair behavior; players’ decision to punish the Dictator and/or to help the Receiver depends on...