http://www.economist.com/blogs/freeexchange/2012/03/currency
Sum it up using the questions as a plan:
1. Which currency is used in the US federal prison? When and under which circumstances did this economy evolve?
2. How profitable is the market of mackerel stand-in?
3. What makes mackerel a good currency? What other type of substitute money can be compared to” mackerel and why?
4. What is a non-convertible currency? What other types of such currency have been in circulation? Where?
5. Which features make Facebook Credit a bad store of value and a medium of exchange?
6. What has become a barrier to the development of Facebook Credit as a payments service?
7. Which changes should be undertaken to turn Facebook Credit into a competitor to PayPal?
8. Which mobile services have evolved and are able to outstrip Facebook Payments Service?
