Could you elaborate? He wrote a book that many considered important, but how specifically did he solve people problems? To me it sounds like he understood emergent behaviors in economics, but didn’t those economicists also believe in the rational actor? That is not an accurate assumption about humanity.
Keynes’ solutions to human problems on a macro scale lifted millions upon millions of people out of poverty in the post-war era
keynesianism eventually failed because corporations and large capital holders will not act rationally towards the whole when they have interests that benefit themselves. so I suppose you’re right. but that doesn’t change the fact that for a good 30 years his ideas and solutions made life better for a huge number of people