Study on the social and economic effects of farm animal welfare 并列题名：Study on the social and economic effects of farm animal welfare Study on the regional economic effects of the industrial cluster 并列题名：Study on the regional economic effects of the industrial cluster Research on the nature and economic effects of market segmentation study on the social identity of traditional teachers Study on the social welfare effect of nonlinear pricing Study on the regional economic effects of fiscal decentralization in China Study on the legal system of ecological welfare Study on the macroeconomic effects of longevity and policy responses