Some mergers are so complex that antitrust authorities and courts are probably very\r\ntempted to decide by flipping a coin. In this paper I try to reconcile the economic approach\r\nto the evaluation of mergers with the one employed in other sciences to study the\r\ncompetitive interaction among different powers. By demonstrating the existence of a very\r\nstrong and hidden link between the Antitrust Logit Model (ALM) and the competition\r\nmodels based on differential equations, I claim that scholars of different fields have studied\r\nthe two sides of the same coin. I suggest that some help to Antitrust authorities could come\r\nfrom the tools used in natural sciences by turning this coin, instead of flipping it.
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