Marketplaces, digital platforms that are open to 3rd party merchants, have steadily increased their share of global digital commerce. In 2007, only 10% of digital sales went to the 3rd party merchants listed on a marketplace. Steadily, and perhaps stealthily, the figure climbed to 35% in 2016, according to Euromonitor International. Retailers around the world are now reckoning with this new normal in digital commerce.