Firstly, because the development of product force social divi-sion of labour further deeped, and the city was also developedproperly, this lays a foundation for the advancement of commodi-ty exchange.

• 一、由于社会生产力的发展，致使社会分工进一步深化，城市也有一定的发展，这为商代的商品贸易发展提供了条件。