can production possibilty curve be convex
 

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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