There is a good article in The Sunday Mail by on why it is wrong to say to an economic idea is 'textbook economics.' I have also held this view for quite some time and to add on to what the author said in his article: when one wants to criticise an idea, explain why that idea does not work and do not simply push it aside by categorising it as textbook economics.
Economic discourse should be guided by the soundness of an idea not by an abstract notion we might ascribe such an idea. If we are to analyse an economics texbook, the ideas therein have been placed in the textbook by consensus and not because economists believe that they are true. Sometimes you will find divergent views placed in an economics textbook to give students alternative ideas explaining a particular situation e.g. the rational expectation versus the adaptive expectations on inflation.
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