See the following -

Cash-Only Doctors Abandon The Insurance System

Steve Hargreaves | CNN | June 11, 2013

Fed up with declining payments and rising red tape, a small but growing number of doctors is opting out of the insurance system completely. They're expecting patients to pony up with cash. Read More »

Direct-Pay Docs Continue To Tout Model

Debra Beaulieu | FiercePracticeManagement | June 12, 2013

With insurance hassles and high overhead continuing to frustrate doctors, news stories continue to roll in about physicians who've adopted a cash-only model and say they've never been happier. Read More »

The Largest Payment Platform On Earth Can Reach 2 Billion People–So Why Haven’t You Heard Of It?

Christopher Mims | Quartz | October 2, 2012

When Jana co-founder Nathan Eagle needed to connect to a cell carrier in the developing world, he’d come to meetings with a duffel bag full of cash and say that he wanted to buy airtime. For carriers who were taking on more customers than ever, but struggling with declining revenue per user, it was an irresistible sales pitch. The result, two years later, is that Jana is now the largest payment platform in the world. Read More »