Assertion: oligopoly's cost | /r/HasProperty | added
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Source sentences:
text: If marginal revenue and marginal costs are added it is possible to show that profits will also be maximised at price P. Profits will always be maximised when MC = MR, and so long as MC cuts MR in its vertical portion, then profit maximisation is still at P. Furthermore, if MC changes in the vertical portion of the MR curve, price still sticks at P.