How Do Sales & Administrative Costs Impact eBay's Income?

Sales, marketing and administrative expenses are major operating costs for eBay , accounting for close to 40% of its total operating expenses in 2015. Considering eBay has to compete against behemoth Amazon in the e-commerce space, its marketing costs were expected to increase but its top line growth has not been commensurate with the increasing investments and advertisements. We see below that eBay’s sales, marketing, general and administrative costs as a percentage of revenues increased an a...