___ is best described as the output range needed to bring down the cost per unit as much as possible, allowing a firm to stake out the lowest-cost position that is achievable through economies of scale.

With only a part-time job and the need for a professional wardrobe, rachel quickly maxed out her credit card the summer after graduation. with her first full-time paycheck in august, she vowed to pay $270 each month toward paying down her $8 comma 368 outstanding balance and not to use the card. the card has an annual interest rate of 18 percent. how long will it take rachel to pay for her wardrobe? should she shop for a new card? why or why not?