Once again, recall that the slope of a PPF is the Opportunity Cost of one good in terms of the other. Since B is a straight line, the OC of good 1 in terms of good 2 is constant no matter what mix of good 1 and good 2 is currently being produced. However, on B the slope is different at every point. The cost, in terms of good 2, for producing more good 1 is higher the more good 1 is already being produced.
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