MIAMI UNIQUE LIMO is a luxury transportation service provider since 2007. The staff works hard to maintain a customer's satisfaction. Fully air-conditioned executive cars or limousines are clean and immaculately presented together with a fully uniformed chauffeur. Chauffeurs are professionally attired, drug screened, and DOT licensed. MIAMI UNIQUE LIMO hires extra drivers during the holiday season because of the increased number of tourists who come to Florida. During slower periods, far fewer chauffeurs are needed. This example shows that services are usually associated with ______. a. more variable costs than goods b. more manufacturing costs c. more fixed costs for selling goods d. better profitability estimates