This paper tests the pro-competitive effect of trade in the product and labour markets of UK manufacturing sectors between 1988 and 2003 using a two-stage estimation procedure. In the first stage, we use data on 9820 firms from twenty manufacturing sectors to simultaneously estimate mark-up and...

In the absence of closed-shops and discriminatory wage policies, union membership can be explained by the existence of social norms. We develop a theoretical frame-work which nests various social custom models. Using micro data for Germany and Great Britain, we find evidence for social custom...