Talking with other travelers while on the road is probably one of my favorite ways to learn about new ideas and gather material to write about. I heard about the mobile banking phenomenon from Jason, an American teacher from Colorado via Costa Rica. While online purchases have increased dramatically in developed countries over the past decade, little has changed by way of how physical, person-to-person transactions take place. Cash transactions date back almost to pre-history, and the credit card that we now consider modern has changed very little since the 1950s. But while the “developed” countries lag behind in forming better currency systems, third world countries have come up with an interesting solution that was undoubtedly an invention spurred by necessity: cell phone currency.