So what's the difference between Conventional Wisdom and Zombie Ideas?

I would say it is that the Conventional Wisdom encompasses so much more.

That is actually a good point Galbraith makes. Keynes ideas won on areas where the Conventional Wisdom crumbled in the 30ies, but where the Conventional Wisdom did not crumble the old ideas remained. So the new Conventional Wisdom - real existing Keynesianism we can call it - came to include a good deal that Keynes was actually opposed to.

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