The long-run supply curve for a decreasing-cost industry is downsloping.

Decreasing-Cost Industry

An industry in which expansion through the entry of firms lowers the prices that firms in the industry must pay for resources and therefore decreases their production costs.

Long-Run Supply Curve

As it applies to macroeconomics, a supply curve for which price, but not real output, changes when the demand curves shifts; a vertical supply curve that implies fully flexible prices.

Downsloping

Typically describes a graph line that shows a decrease in a variable as another variable increases, often used in economics to illustrate concepts like demand curves.