We analyze the bias from predicting merger effects using structural models of price competition when firms actually compete using both price and promotion. We extend the standard merger simulation framework to allow for competition over both price and promotion and ask what happens if we ignore...

We are given a lot of tools, but no warning label on how or when to employ them. Michael Doane (Competition Economics, LLC), Luke Froeb & Steven Tschantz (Vanderbilt University)

In this paper, we study mergers in oral or second-price auctions and compare them to mergers in sealed-bid or first-price auctions. We use an adaptation of the logit qualitative choice model to characterize the underlying bidder value distributions. In second-price auctions, this model has a...