Many scholars say it is the "natural outcome of the business cycle." However, another reason is the completion of the Uruguay Round of the General Agreement on Tariffs and Trade (GATT) at the end of 1993.
有些學者認為是「經濟循環的自然結果」，不過其中較明顯的原因之一，是和九三年底世界關貿總協（GATT）會員國達成烏拉圭回合協議有關。