As production workers become better organized and more familiar with equipment, the average cost per unit tends to decrease with the accumulated  production experience.
It refers to the gain a company experiences in producing a product over a period of time. Workers learn shortcuts, materials flow more smoothly, and procurement costs fall. The result is that average cost falls with accumulated production experience. This decline in the average cost with accumulated production experience is called the experience curve or learning curve.
Considering accumulated production experience, the decrease in average cost is classified as:
Therefore, we can conclude that the correct option is accumulated  production experience.
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