Although many economists believe that there is anegative correlation between trade barriers andeconomic growth, the issue is far from resolved.There are studies that have obtained mixed results onthe effect of trade barriers on growth. Such resultscould be due to model misspecification, erroneousmethodology or country and world specific conditions.This paper investigates the impact of trade barriersunder certain country specific conditions to helpdetermine if such mixed results are at leastpartially due to different conditions in differentcountries. The country specific conditions to beinvestigated are market size, availability of exportcredits and technological spillovers due to trade. Chapter 1 "The Case of Largevs. Small Economies", investigates whether marketsize has any impact on how trade barriers affecteconomic growth. Chapter 2 "The Case of ExportCredits", looks at the impact of trade barriers oneconomic growth in the presence of export credits.Chapter 3 "Do Potential Technological SpilloversMatter for How Trade Restrictions Affect Economic Growth?" focuses on theimpact of technological spillovers on economic growthdue to trade.