‘Social Darwinism’ has been associated in academia and popular consciousness with negative concepts such as hyper-nationalism and eugenics. Geoffrey M. Hodgson challenges the notion that Social Darwinism or its proponents were ever well-defined. By tracing the use of ‘Social Darwinism’ across academic disciplines and globally over a long period, Hodgson argues that ‘Social Darwinism’ was far more complicated than previously understood.