The influence of the Institute of Economic Affairs on [[Margaret Thatcher]] and also her political allies such as [[Ronald Reagan]] led respected commentator Andrew Marr to describe the IEA as "undoubtedly the most influential think tank in modern British history."<ref>Marr, A. (2006) ''A History of Modern Britain'' | The influence of the Institute of Economic Affairs on [[Margaret Thatcher]] and also her political allies such as [[Ronald Reagan]] led respected commentator Andrew Marr to describe the IEA as "undoubtedly the most influential think tank in modern British history."<ref>Marr, A. (2006) ''A History of Modern Britain'' |