As the production volume doubles, the labour hours required decrease by a constant proportion. This is known as leaning curve.
What is leaning curve?
A learning curve graph demonstrates how quickly something may be learned over time or with practice. Learning curves are a visual representation of how much knowledge has been acquired over time and how challenging a subject is expected to be.
The cumulative average time needed for each unit decreases to 70% of what it was previously. The first unit ever produced is used to calculate the cumulative average time per unit.
Thus, it is leaning curve.
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