The production possibilities frontier is typically drawn so that it has a bowed-out shape, or concave to the origin. This shape implies that:

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The bowed-out shape of the production possibility frontier (PPF) represents the concept of increasing opportunity costs. As more of a good or service is produced, the opportunity cost of producing an additional unit increases. This is because resources are not equally efficient at producing different types of goods, so as more resources are devoted to one type of production, there are fewer resources available to produce another type of good. Therefore, society must give up increasingly larger amounts of the alternative good to produce more of the first good, leading to the bowed-out shape of the PPF.

The Production Possibilities Frontier Is Typically Drawn So That It