Charles Kenny argues that
The much-ballyhooed microfinance organizations such as Grameen Bank have an important role to play in filling the gap, but it's not necessarily a huge one. After a decade of extraordinarily rapid growth, there were only about 154 million microfinance clients worldwide at the end of 2008. There are still 2.5 billion adults with no access to formal financial services, including 80 percent of adults in sub-Saharan Africa.
The affordability and reach of electronic systems supported by vendors means it is now plausible to imagine universal access to basic financial services.