用主要产品来研究经济史主要是加拿大的创举;这确实也是加拿大对政治经济学最有特色的贡献。在输出已占主导地位的大多数国家,这种理论并没有得到明显的发展。这个专门名词——主要产品或几种主要产品(staple or staples)研究法,或者理论或者命题——是加拿大人提出的,同时象加拿大社会科学家和经济史学家那样坚持应用这种理 Using major products to study economic history is primarily a Canadian initiative; indeed, it is also Canada’s most distinctive contribution to political economy. In most countries that have dominated output, this theory has not been significantly developed. This term, the staple or staples approach, or theory or proposition, was proposed by the Canadians and at the same time insisted on applying the principle as the Canadian social scientists and economic historians