Total U.S. e-commerce spending grew by 18 percent in 2013, reaching just under $320 billion. The report estimated that 11 percent of e-commerce spending in 2013 was done through smartphones, now known as mobile-commerce or m-commerce.
The report explained that this is likely a result of "showrooming"--when consumers trek to brick-and-mortar shops to check out new products and then buy them from a cheaper vendor online.
The report said: "Smartphones have become consumers’ most valued shopping companion as showrooming quickly becomes standard practice for in-store shoppers."
It warned that 2014 could mean trouble for companies who are unable to maintain presence multiple channels such as physical, online, and mobile stores.