By Kirsten Salyer
Naked Capitalism on the evolution of money and debt
Business Insider on how 30 years of black middle-class economic gains were wiped out
The World Bank on a global database of economic characteristics for countries from 1960 to 2010
Center for Economic History on risk management in London from 1690-1730
Economix on how baby boomers are affecting economic recovery
Read more from Echoes, Bloomberg View's economic history blog.