What does a production possibilities frontier show?

A production possibilities frontier (PPF) illustrates the maximum possible output combinations of two goods or services that an economy can produce given its resources and technology. It demonstrates the trade-offs between the two goods, highlighting opportunity costs and the concept of efficiency in production. Points on the frontier indicate efficient production levels, while points inside the curve reflect inefficiency, and points outside are unattainable with current resources. The shape of the PPF can also indicate the nature of opportunity costs, which may vary depending on the resources used.