Market concentration in e-commerce in the U.S. 2018

The U.S. eCommerce market is a little more concentrated than the German eCommerce Market. The Top 3 players in the U.S. are amazon.com, walmart.com are apple.com. Those three stores generated US$87.1 million in 2018 which equals 27% of the U.S. eCommerce Market. amazon.com alone accounted for 2018 19.8% of the market volume. Compared to 2017 the market concentration has not chanced noticably. The same top 3 companies have also accounted for 27% of the market share in 2017 growing at the same speed as the U.S. eCommerce Market.

Measure of concentration

A common measure for market concentration is the market share. The higher the market share of the largest companies the more concentrated is the market. Usually the share of the top 3 players indicates the level of concentration in a market. Because of the internationalty of eCommerce and the dominance of global players like amazon.com the concentration is typically high. The ongoing growth of the market makes it easier for newcomers to enter.