I enjoy Keynes on this in 1930 -- http://www.econ.yale.edu/smith/econ116a/keynes1.pdf http://www.econ.yale.edu/smith/econ116a/keynes1.pdf -- remembering, of cou

I enjoy Keynes on this in 1930 -- http://www.econ.yale.edu/smith/econ116a/keynes1.pdf http://www.econ.yale.edu/smith/econ116a/keynes1.pdf -- remembering, of course, that unforeseen economic shocks make predicting the course of implementation nearly impossible. In his case, it was WW2.