Production Possibilities Curve (PPC)
Plain definition
The production possibilities curve (also called the frontier, PPF) shows the maximum combinations of two goods an economy can produce when its resources are fully and efficiently employed. Points on the curve are efficient, points inside it are inefficient, and points outside are unattainable with current resources.
In economics
The PPC is the economy's visual summary of scarcity, trade-offs, and opportunity cost. Its bowed-out (concave) shape reflects increasing opportunity cost: shifting resources from one good to the other gets costlier as the easy resources are used up. Economic growth, resource discoveries, or better technology shift the whole curve outward.
Example
An economy making only wheat and phones faces a PPC: producing 1 million more phones may require giving up 2 million tonnes of wheat. If it is operating inside the curve (say, with unemployed workers), it can make more of both without any trade-off — growth without sacrifice.
A frequent mistake is reading any point inside the curve as impossible rather than inefficient. Inside the curve is possible but wasteful — resources sit idle. Only points beyond the curve are truly unattainable. Conversely, a point on the curve is efficient but not automatically the best — society must still choose which efficient mix it prefers.