This paper argues that the bias of conventional economics needs to be replaced with a more realistic theoretical basis, which will hold market power at its core. It can be divided into three parts. First of all the paper discusses the challenges to the basis of economic theory that have been posed over a long period, and especially challenges to the fundamental concepts of perfect competition and general equilibrium. Along the way, it notes the astonishing number and variety of leading economists who have themselves commented on their discipline’s failure to explain adequately how markets work and how prices are formed, although one might have thought that those were at the very heart of its subject matter.