Why does PPC look concave to the origin? ?

1.	Why does PPC look concave to the origin? ?
Answer» PPC is concave to the origin\xa0because of increasing Marginal opportunity cost. This\xa0is\xa0because inorder to increase the production of one good by 1 unit more and more units of the other good have to be sacriced since the resources\xa0are\xa0limited and\xa0are\xa0not equally efficient in the production of both the goods.

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