The scope of the book is wide. It includes successes and failures, main challenges and debates, methodologies for impact evaluation via random trials, leading trends in Asia versus Latin America, main efforts in Africa, the importance of value chains in Central America, ethical and gender issues, savings, microinsurance, governance, commercialization trends and the potential advantages and disadvantages of it. Lastly it features main lessons from informal finance and 19th-century credit cooperatives addressing the above-mentioned mismatch.