GameStop operates video game, consumer electronics and wireless services around the globe in over 6,600 stores worldwide. According to their website, "GameStop is committed to delivering innovation to consumers anywhere, anytime and anyway they want it." GameStop enables its consumers to trade-in games and purchase new, pre-owned, digital or physical video game titles and offers the latest in hardware and accessories. The Chief Marketing Officer of GameStop would most likely be concerned with tracking which of the following to help forecast sales volume in the future?
a. consumers' discretionary income
b. consumers' wealth
c. consumers' debt
d. consumers' disposable income
Answer: a. consumers' discretionary income