In the context of a Production Possibility Curve (PPC), what does the concept of opportunity cost primarily illustrate?

The concept of opportunity cost in the context of a Production Possibility Curve (PPC) illustrates the idea that when we choose to produce more of one good, we must give up some quantity of another good. The PPC shows the maximum possible production levels of two goods, and any point inside the curve indicates that resources are not being used efficiently. For example, if a country decides to produce more cars instead of bicycles, the opportunity cost is the number of bicycles that will not be produced as a result. This helps us understand that every choice we make in production comes with a trade-off, highlighting the importance of making informed decisions. In simple terms, opportunity cost teaches us to consider what we are sacrificing when we choose one option over another.