As existing firms exit a decreasing-cost industry

A) the LRAC curve shifts down.
B) the LRAC curve shifts up.
C) the position of the LRAC curve doesn't change, but firms move down their LRAC curve.
D) the position of the LRAC curve doesn't change, but firms move up their LRAC curve.

Decreasing-Cost Industry

An industry in which production costs decrease as the industry grows and output increases, often due to economies of scale.

LRAC Curve

The Long-Run Average Cost curve, showing the lowest possible cost of producing different levels of output when all inputs are variable.