I would definitely not include Stranger. But you make a good point, @alex_levene, because in there lurks utopianism. Authors who tried to imagine a different economy were generally trying to underpin some kind of utopian society. Dystopians generally get by by imagining some kind of capitalism on steroids, like William Gibson in The Peripheral.
I have been toying with the idea to include something from Iain Banks's Culture series, exactly because of that: it is perhaps the most convincing (non-creepy) positive utopia I have ever read. There is, I think, the spectre of Keynes lurking behind it, specifically his much-loved 1930 essay Economic possibilities for our grandchildren (full text). In it, Keynes foresees a society of abundance ("we already have the technology!"), where the problem would have been how to keep people busy when there is no need for working. But no: the economy of the Culture in Banks is completely waved through. Nothing to learn there.