$[$A$]\_\_\_\_\_$ establishes the rate of improvement because of learning as producers realize direct$-$labor cost improvements as production volumes increase.$$

Group of answer choices

$$learning curve

$$knowledge curve

$$product life cycle

$$leverage

$$short$-$term contract$[$A$]\_\_\_\_\_$ establishes the rate of improvement because of learning as producers realize direct$-$labor cost improvements as production volumes increase.$$

Group of answer choices

$$learning curve

$$knowledge curve

$$product life cycle

$$leverage

$$short$-$term contract