Additive and Multiplicative Uncertainty Revisited: What Explains the Contrasting Biases?

above the certainty level while for additive uncertainty the price should be lower than the certainty level. This note gives an intuitive explanation for the result after first presenting a parsimonious review of the two models. We also discuss which, if either, of the two models is more realistic. Received December 14, 2001; revised version received July 16, 2002 Published online: April 30, 2003 We thank referees for helpful comments. Ciaran Driver would like to acknowledge the research facilities from ANU, Canberra for their help in writing this paper.     

GATT/WTO与管理贸易

现实中的国际贸易不是自由贸易，国际贸易体制中一直都是自由贸易和贸易保护同时并存，以1GATT／WTO也不是自由贸易组织。管理贸易是指介于纯粹自由贸易和完全贸易保护之间的各种情形，其特点是规则导向、有较大兼容性以及可塑性。管理贸易的发展可以有两个完全相反的方向，而GATT／WTO倡导的贸易自由化实质上是在自由贸易和贸易保护两种成分并存的国际贸易体制中抑制贸易保护、提高贸易自由的程度。