Investigation of Quick Reaction of Tehran Securities Exchange to International Economic Announcement Publications

Volatility of price movements on stock security exchange is of great importance. Entering of new information to stock security exchange can result in price movement volatility. With regard to this important point, this research is aimed at considering the quick reaction of Tehran Security Exchange to the internationally published economic announcements. Since U.S economy is known as the axis of economic crises of the world, the quick effect of U.S Job Union (USJU) which is grounded on job opportunities reduction rates has been investigated on Tehran Exchange Security by event study methodology during 1390. The research’s results which have been done on a sample containing 5o listed companies of Tehran Security Exchange during 1990 indicated that the USJU’s internationally published announcement has no information effect on Tehran Security Exchange.