WSJ Reporter, in New Book: "The Entire United States Market Has Become One Vast Dark Pool"

`` I argue in this book that the entire United States stock market has become one vast dark pool. Orders are hidden in every part of the market. And the complex algorithm AI-based trading systems that control the ebb and flow of the market are cloaked in secrecy. Investors -- and our esteemed regulators -- are entirely in the dark because the market is dark." ''