Serious aggregation errors may arise in mathematical programming sector models when aggregation is not properly done. Existing aggregation literature mostly focuses on exact aggregation of homogenous groups of firms. However, homogeneity rarely holds in real problem situations. Moreover,...

We utilize an enhanced gravity model to estimate the effect of lagged immigration waves on Canadian imports and exports by province. Empirically, this model was tested using Canadian data on import and export flows to the top 40 countries of origin for Canadian immigrants based upon the...

Article XVIII(B) of the GATT code allows developing countries to use tariffs to reduce imports when their balance-of-payments problems result in a low foreign currency reserve. While the intent of this GATT provision is sound, it has led to moral hazard problems. This chapter reviews the history...