The man who sparked the flat tax revolution is former Estonian Prime Minister Mart Laar. He governed his country from 1992 to 1995 and from 1999 to 2002. When the historian became Prime Minister in 1992 at the age of 32 he knew nothing about economy. Laar’s area of expertise were Europe’s 19th-century national movements. “It is very fortunate that I was not an economist,†he says. “I had read only one book on economics – Milton Friedman’s “Free to Choose.†I was so ignorant at the time that I thought that what Friedman wrote about the benefits of privatisation,...