There's no denying that Amazon's retail business had an impressive 2017 and there's still plenty of room for the company to grow in certain categories this year.
The internet giant was responsible for about 44 percent of all U.S. e-commerce sales last year, or about 4 percent of the country's total retail sales figure, according to One Click Retail, an e-commerce analytics provider.
"Every major trend we see across 2017 can be explained by the fact that more of Amazon's core demographic (millennials) are growing up: they're increasingly owning homes, raising children, and buying a TON of stuff to go with it," One Click Retail CEO Spencer Millerberg wrote in an annual review of Amazon.
This was excerpted from the 3 January 2018 edition of CNBC.