1.5.4—Position within a PPC

A point on a PPC represents productive efficiency: the available resources and technology are used to produce a maximum attainable combination. A point inside is attainable but inefficient; a point outside is currently unattainable.

The interpretation assumes the PPC’s resources, technology and institutional setting are fixed. An economy can move from inside towards the frontier by reducing unemployment or misallocation.

A country producing below its frontier may increase both food and machinery without a trade-off until it reaches the curve; moving along the curve then requires giving up one output.

A point outside is not “inefficient”—it cannot be produced with the current constraints.