What is the specific purpose of the electric motor indicated by the large arrow? 
Definitions:
Marginal Cost
The supplementary cost attached to the output of an additional product or service unit.
Diminishing Marginal Product
The principle stating that as one inputs more of a factor of production while holding other inputs constant, the added output produced from each additional unit of the variable input eventually decreases.
Fixed Costs
Fixed costs are business expenses that remain constant regardless of the level of production or sales, such as rent, salaries, or loan payments.
Marginal Cost
The added expense incurred by creating one more unit of a product or service.
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