.. covers the point that efficient markets are not deceptive markets. Participants are assumed to share equal information.

Are 'efficient markets', defined by not being deceptive, and all participants having equal information, a requirement to call something 'capitalism'? Does that mean capitalism has never been tried? How long can such a system last, when it is in the financial interest of a large part of the participants to make the markets less 'efficient', so they can extract a higher price for less work?