When you move from one point to another on the production possibilities frontier (PPF) and the opportunity cost of producing one good in terms of the other good does not change, then the PPF

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If the opportunity cost of producing one good in terms of the other good does not change as we move along the PPF, then the slope of the PPF remains constant, and the PPF is a straight line. In other words, the resources used to produce one good can be easily switched to produce the other good without sacrificing efficiency or increasing opportunity cost. This implies that the two goods are perfect substitutes, and the PPF is linear.

When You Move from One Point to Another on the Production