All mainstream approaches have thoroughly rejected Keynes in the long run ~ the difference is whether it is admitted that Keynes has some relevance in the short run, which the majority denies but a large group of mild neoclassical dissenters under the banner of New Keynesian supports.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.