I've been in many scenarios (a lan party comes to mind) where there were multiple people who had either large bills or no cash at all, and yet we needed to buy

I've been in many scenarios (a lan party comes to mind) where there were multiple people who had either large bills or no cash at all, and yet we needed to buy things like beer or pizza. This makes it very easy for people to transact small amounts of money (ideally free through paypal) using this technology. People may forget their cash, but they never forget their phone. Neat. Brian