Just to throw my 5 cents in, what I've see being passed off as 'Islamic Economics' has been nothing more than Socialism in drag; socialism by any other name is still socialism. In Muhammad H. Haykal's 'Life of Muhammad' (if you read it, take what he says with a grain of salt, he seems to love ranting against the system) he talks about the 'Islamic Economic System' where he uses words like brotherhood, community, comrade, the responsibility of the collective, etc. Basically socialist terms with religious overtones. Basically he sounds like the sort of theology one can see when you hear left win