摘要：This paper shows, using data from both the US and the UK, that average plant
size is larger in denser markets. However, many popular theories of
agglomeration – spillovers, cost advantages and improved match quality – predict
that establishments should be smaller in cities. The paper proposes a theory
based on monopsony in labour markets that can explain the stylized fact – that
firms in all labour markets have some market power but that they have less
market power in cities. It also presents evidence that the labour supply curve
to individual firms is more elastic in larger markets.
