A shopper pays with cash back in 2000 in Austin, Texas. Such transactions are less and less common and are likely to become more so if the Federal Reserve adopts a digital version of the dollar. Joe Raedle/Getty Images hide caption
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Venmo is used to pay or request money from other people on the app. Every transaction has a memo line, and the app suggests emoji instead of words like "rent," "pizza," and "wine." Amr Alfiky/NPR hide caption
As Payments Go Social With Venmo, They're Changing Personal Relationships
Apps like Venmo promise easy, carefree money transfers between friends. Noah Nelson/Youth Radio hide caption