 He goes further to suggest that broad technological changes and unethical trading practices have transformed the U.S. stock market from "the world's most public, most democratic, financial market" into a "rigged" market.The book has drawn criticism from some academics and industry experts, particularly on Lewis's grasp of HFT and other factual inaccuracies in its depiction of trading.Other critics have praised Lewis's explanations of trading concepts and concurred with his criticism of HFT; however, it is suggested that he neglects to pay attention to the larger issue of financial regulation, and had excessively simplified the relationship between various institutions in the financial market.