With the development of manufacturing and technology ,there arose another incentive for trade,i.e.international specialization-one country producing more of a commodity than it uses itself and selling the remainder to other countries. Such specialization constitutes an important basis for international trade.
随着生产和技术的发展，产生了另一个刺激国际贸易的因素，即国际生产专门化---一个国家所生产的某种商品数量超出它的消费，并将所剩商品卖给其他国家。这种专门化构成了国际贸易的一个重要基础。
