The usefulness of mobile payment services, as used by consumers, might be hard to ascertain.
But it is clear that retailer adoption is accelerating
Mobile transactions will account for about two percent of all credit and debit card volume in the United States in 2013 and four percent globally, according to BI Intelligence.
Just what percentage of small retailers have adopted mobile card readers such as Square is a matter of debate. What is not debatable is that mobile card readers such as those offered by Square have become a big deal.
By some estimates, 40 percent of retailers already are using mobile card readers.