What does the slope of a ppf represent?

The slope of a production possibilities frontier (PPF) represents the opportunity cost of producing one good over another. Specifically, it indicates how much of one good must be sacrificed to produce an additional unit of another good. A steeper slope suggests a higher opportunity cost, while a flatter slope indicates a lower opportunity cost. Additionally, the slope can change along the curve, reflecting the principle of increasing opportunity costs as resources are reallocated between different goods.