SG&A expense for Amazon, according to S&P Capital IQ, consists of
fulfilment, marketing, and general and administrative expense (i.e.,
excluding technology and content). In the figure below, we see that this
spending experienced the highest growth rates in 2011, and declined each
year since, as seen in the figure below.
These expenses were essentially investments Amazon made to grow its
business. The company explained the increase in fulfilment costs was
related to higher sales volume, inventory and sales levels, and from
expanding capacity
Marketing spending went to online and TV advertising
and its Associates. General and Administrative expenses (G&A) grew with
expanding payroll and professional services