if company A has 12% market share by rev and B has 8% market share by rev how do I calculate their combined profit margin? additional info is A has 4% profit margin before economies of scale and B has 3% profit margin before economies of scale. due to economies of scale the addition profit margin for A is 1.2% and for B is 0.8%. its assumed that by adding 0.1% to profit margin for every 1% market share
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