Marshall and the development of 'Neoclassical' economics

Historians of Economic thought normally regard Alfred Marshall as one of the key figures in what has come to be known as 'neoclassical economics'. However, Marshall's analysis departs significantly from many of the prominent 'neoclassical cofounders', and consequently his contributions need to be considered separately from other 'neoclassicals'. His departures from purist 'neoclassical' analysis can be most clearly illustrated in his treatment of increasing returns, where the limitations of the 'neoclassical' tools of analysis are clearly exposed.