Shackle and uncertainty

Reading this interview with G.L.S. Shackle, I am struck by this point:

“involuntary unemployment” merely means that there are people who haven’t enough faith in their expectations to give employment.

Something I’ve always been unclear about with regards to Keynes is whether he (and the post Keynesians, and weird hybrids like Shackle) believed that uncertainty was the only barrier to full employment. There is no obligation on anyone to use all the resources at their disposal. You could argue that the only reason anyone ever maintains excess resources is because of uncertainty, but this presupposes that you – the individual entrepreneur – have direct control the quantity of the resources available to you.

In this context the “resource” is the population of employable people. The entrepreneurial class does not control the population of employable people, and it is not clear that they would necessarily choose to employ the entire population of employable people, even if they had perfect foresight. Indeed it could be argued that the *ahem* entrepreneurial class has an interest in keeping a reserve army of labour unemployed so as to maintain discipline within the ranks of those they do choose to employ.

Once again, economics ignores the political dimension.