1. In a homogenous good Bertrand duopoly model with complete and symmetric information the Bertrand paradox arises because the firms compete using _________ as their choice variable. 2.  Suppose there is an industry with nine firms where two of them have a market share of 0.2, three of them have a market share of 0.1 and the remaining firms have a market share of 0.075. The 4 firm concentration ratio is______. (two decimal accuracy)

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