When employers face a trade-off between growing large and paying low wages - that is, when they have monopsony power - some productive employers will decide to acquire fewer customers, forgo sales, and remain small. These decisions have adverse consequences for aggregate labor productivity....

Since 1994, the German banking market is confronted with an entry wave of direct banks. This banking innovation may be explained by developments on the supply side as well as on the demand side. It is pushed by developments in telecommunication technologies during a period of rising cost...

Feenstra and Ma (2008) develop a monopolistic competition model where firms choose their optimal product scope by balancing the profits from a new variety against the costs of "cannibalizing" sales of existing varieties. While more productive firms always have a higher market share, there is no...