If two firms in an oligopoly produce undifferentiated products and face identical constant marginal costs, then, absent any implicit or explicit collusion, they will price at marginal cost regardless of whether they move sequentially or simultaneously -- assuming price is the strategic variable.

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In this scenario, neither firm has an incentive to charge a higher price because they would not gain any market share and would risk losing customers to the competitor. Therefore, both firms will price at the level of marginal cost, regardless of whether they move sequentially or simultaneously. This is known as the Bertrand competition model. However, if there are any barriers to entry or other market imperfections, the pricing strategy may differ.

If Two Firms in an Oligopoly Produce Undifferentiated Products and Face