Keynes always intended to write 'footnotes' to his masterwork The General Theory, which would take account of the criticisms made of it and allow him to develop and refine his ideas further. However, a number of factors combined to prevent him from doing so before his death in 1946. A wide range of Keynes scholars - including James Tobin, Paul Davidson and Lord Skidelsky - have written here the 'footnotes' that Keynes never did.
'These volumes will be appreciated by Keynes scholars, old and new, for the light they tend to shine on their subject...this 'second edition' of the General Theory will assist in ensuring that the thought of the greatest economist of the twentieth century, for that is what Keynes undoubtedly was, will continue to reverberate in the minds of economists as we enter the twenty-first century. - History of Economics Review