Earlier results on estimating markup ratios as indicators of the competitive pressure are discussed and it is shown that the estimation method suggested by Roeger (1995) suffers from similar problems as an earlier method suggested by Hall (1988). It is also shown that the estimating equations...

Patent expiration represents a turning point for the brand losing patent protection as bioequivalent generic versions of the drug quickly enter the market at reduced prices. In this paper, we study how physician characteristics and their prescribing decisions impact the competition among...

Focusing on homogeneous beliefs, we can distinguish two commonly shared ideas that, i) the competition between informed traders destroys their trading profits, ii) trading with a noisy signal brings about a loss in the expected profits. So far, it has been proved in the latter framework, that...

How do changes in market structure affect the US business cycle? We estimate a monetary DSGE model with endogenous firm/product entry and a translog expenditure function by Bayesian methods. The dynamics of net business formation allow us to identify the "competition effect", by which desired...

As paid search becomes the mainstream platform for online advertising today, competition further intensifies. The main objective of this research is two-fold. On the one hand, we want to understand, in the context of paid-search advertising, the effects of competition (measured by number of ads...