The increasing usage of mobile communication and the declining demand for fixed line telephony in Europe make the analysis of substitutional effects between fixed and mobile networks a key aspect for future telecommunication regulation. Using a unique dataset which contains information on all 27...

The increasing usage of mobile communication and the declining demand for fixed line telephony in Europe make the analysis of substitutional effects between fixed and mobile networks a key aspect for future telecommunication regulation. Using a unique dataset which contains information on all 27...

This paper estimates the importance of network effects in the market for Yellow Pages. I estimate three simultaneous equations: consumer demand for usage of a directory, advertiser demand for advertising and a publisher's first-order condition (derived from profit-maximizing behavior)....

We develop a model with one innovating northern firm and heterogeneous southernfirms that compete in a final product market. We assume southern firms differ in their intrinsiccosts and their ability to adapt technology and study southern incentives to protect intellectualproperty rights. We find...

This paper describes major external changes to the U.S. public agricultural researchsystem over 1988-1999; describes the reactions of the public agricultural research system to theexternal changes, specifying the innovations that have occurred over the last decade; and drawsconclusions about the present...