Depiction of Soaps, groceries and app stores: extending merger price-rise analysis

Soaps, groceries and app stores: extending merger price-rise analysis

Simple tests based on firms producing a single product have become increasingly popular among competition authorities looking to assess the effect of mergers on prices. In reality, however, firms often produce several related products. Does this introduce any potential biases to these tests? If so, what can be done to mitigate them?

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