I don't know about "economist," but if we are once again venturing out into "political economy" and "economics" as we do every so often (did we ever start a "FAQ"?), then Peter Groenewegen is the source on this, though somebody's student is probably disputing his stories (like happened with Groenewegen's student Aspromourgos on "neoclassical"). Start with Groenwegen's Palgrave entry "'political economy' and 'economics'." That's one entry, with each term in quotes. Mat Forstater