Research on the nature and economic effects of market segmentation 并列题名:Research on the nature and economic effects of market segmentation Research on the influencing factors and economic effects of China's credit rating Research on the economic effects of Chinese national debt Research on the micro economic effects of product quality improvement Research on the structure and aggregate effects of regional opening economy Research on the economic effects of excise taxation in China Research on the economic effects of the Belt and Road initiative research on the materiality of animation