Final answer:
The midpoint method of calculating elasticities uses the average value of the variable to determine the percent change, providing consistent elasticity results for price increases or decreases.
Step-by-step explanation:
The Midpoint Method for elasticity is used to calculate the average percent change in both quantity and price along a demand or supply curve. According to this method, the percent change in a variable is determined by dividing the change in the variable by the average value of the variable. This approach calculates the percent change from the average of the initial and final values, thereby ensuring the same elasticity result whether prices increase or decrease.