The way in which securities are traded is very different from the idealized picture of a frictionless and self-equilibrating market offered by the typical finance textbook. In Market Liquidity, Thierry Foucault, Marco Pagano, and Ailsa R ell offer a more accurate take on the liquidity of securities markets, its determinants, and its effects. They start from the assumption that not everyone is present at all times simultaneously on the market, and...