Economists are in broad agreement because they're paid to be. This is well-documented historically.
The Mont Pelerin Society was specifically founded to promote a certain view of economics, and the Chicago School was supported financially by some very rich sponsors who wanted a a pet academic alternative to progressive slant of Keynesianism.
The "consensus" in neoliberal economics and its core ideas - including "rationality" and "efficiency" - is a wholly manufactured political project, not an organic open-minded attempt to find credible scientific foundations.
The Mont Pelerin Society was specifically founded to promote a certain view of economics, and the Chicago School was supported financially by some very rich sponsors who wanted a a pet academic alternative to progressive slant of Keynesianism.
The "consensus" in neoliberal economics and its core ideas - including "rationality" and "efficiency" - is a wholly manufactured political project, not an organic open-minded attempt to find credible scientific foundations.