Abstract
We introduce a new measure of competition: the elasticity of a firm’s profits with respect to its cost level. A higher value of this profit elasticity (PE) signals more intense competi- tion. Using firm-level data we compare PE with the most popular competition measures such as the price cost margin (PCM). We show that PE and PCM are highly correlated on average. However, PCM tends to misrepresent the development of competition over time in markets with few firms and high concentration, i.e. in markets with high policy relevance. So, just when it is needed the most PCM fails whereas PE does not. From this we conclude that PE is a more reliable measure of competition.
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