A multiple regression model has the form 
. The coefficient 
is interpreted as the change in 
per unit change in 
.
Definitions:
Quantity
The amount or number of a material or immaterial good considered as a unit or total.
Average Total Costs
The total cost of production (including both fixed and variable costs) divided by the number of units produced, representing the average expense per unit.
Marginal Cost
The price associated with the creation of one more unit of a product or service.
Average Total Cost
The per-unit cost of production, calculated by dividing the total cost of production by the quantity of output produced.
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