This paper seeks to explain why more than half of the German service sector firms that introduce a product innovations do not advertise their new or markedly improved product. One part of the explanation is that they do not need to advertise because they are closely related to their customers...

This paper investigates the impact of modern information and communication technologies on the demand for heterogeneous labor. It starts with an interrelated factor demand system. The 'desired' level of employment which is needed in such models, is derived from a Generalized Leontief cost...