Final answer:
The variable cost per unit corresponds to the slope parameter, which in a cost function is the rate of change of total cost with respect to output quantity.
Step-by-step explanation:
The variable cost per unit of output corresponds to slope parameter of the linear equation that represents the cost function in economic terms. In a cost model equation, the slope signifies the change in total cost resulting from a one-unit change in the quantity of output produced, which in this context, is the variable cost per unit.
This can be represented by the equation y = vx + f, where y is the total cost, v represents variable cost per unit (slope), x is the number of units produced (independent variable), and f is the fixed cost (intercept parameter).