Final answer:
The average demand for women's running shoes is calculated using the demand function by plugging in the values for the price of running shoes, the price of socks, and consumer's income. With the prices at $100 for running shoes, $20 for socks, and the income at $100,000, the average demand comes out to be 8,700 pairs.
Step-by-step explanation:
The student inquiry concerns the calculation of the average demand for women's running shoes based on a given demand function. To find the average demand, we can input the given average prices and consumer income into the demand function Qrs = 10,000 - 10Prs - 20Ps + 1/1000M. Given that Prs = $100 (price of running shoes), Ps = $20 (price of socks), and M = $100,000 (consumer's income), the calculation would be:
Qrs = 10,000 - 10(100) - 20(20) + 1/1000(100,000)
Qrs = 10,000 - 1000 - 400 + 100
Qrs = 8,700
Therefore, the average demand for women's running shoes, when the average price of running shoes is $100, the average price of socks is $20, and the average consumer's income is $100,000, is 8,700 pairs.