Using the table, calculate the marginal cost of each quantity of shoe inserts. The first pair: $ The third pair: $ The fifth pair: $ Average Household Income in Desertville Your research tells you that households earning $55,000 or more are most likely to be interested in a new shoe store. Households earning $25,000 or more are likely to visit coffee shops. would have a larger potential customer base. is geared toward individuals with more disposable income.