As has been the case for most of the past year, rising gasoline prices boosted Costco's reported comp sales results thanks to the company's substantial gas station business. As has been the case for much of the past year, appliances, computers, and tablets were all standout performers, as Costco has capitalized on competitors' store closures. In the past two years, Costco has benefited enormously from a new credit card deal, a membership fee increase, and the reduction in the corporate tax rate.