Why do production possibilities curves slope down from left to right?​

The downward sloping nature of the PPC is due to the law of increasing opportunity cost. According to this law, with the fuller utilisation of the given resources, in order to produce an additional unit of one good, some of the resources are to be withdrawn from the production of another good.

Explanation:

the correct answer is economics is a game without winners or losers.

unlike sports or games economic is a game without losers or winner rather it is a game where everyone wins. parties of business doing businesses exchange money with each other and hence exchange is done on the basis of goods. one party takes the goods and other sales it so there is winner on both sides. each party values more highly the good it gets than the good it gives up. both sides exchange only because both intend to increase their value. so there is no concept of lose or win.