can a PPC show a convex curve? explain?

Answer provided by Shivi is correct. A production possibility curve (PPC) is a curve which shows different combination of two goods that can be produced using all the resources of an economy with a given level of technology. By assumption a PPC is concave shaped to the origin, and this is because of the increasing marginal rate of transformation (MRT). A PPC can take convex shape only if the MRT decreases.

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yes, ppc shows a convex curve when marginal opportunity cost decreases .In order to produce more and more units of output(x) , less and less units of output(y) are sacrificed .this causes diminishing rate of sacrifice .do not confuse with rate of sacrifice and MOC . both are same .

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