Markups and markdowns
Abstract
This paper studies the high yet undocumented incidence of firms displaying markups lower than unity, i.e., prices
lower than marginal costs, for protracted periods of time. Using a large sample of French manufacturing firms for the
period 1990-2007, the paper estimates markups at the firm level and documents the extent to which firms exhibit
negative price cost margins. The paper is able to provide an explanation for this phenomenon using the option value
approach to investment decisions. The results suggest that firms facing higher investment irreversibility tend to
continue operating even when prices fall below marginal costs as they wait for market conditions to improve. This
effect is magnified in the presence of uncertainty.
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