sentences:  Orthodox economists fully acknowledge that perfect competition is seldom observed in the real world, and so aim for what is called "workable" or "effective competition".This follows the theory that if one cannot achieve the ideal, then go for the second best option by using the law to tame market operation where it can.A group of economists and lawyers, who are largely associated with the University of Chicago, advocate an approach to competition law guided by the proposition that some actions that were originally considered to be anticompetitive could actually promote competition.