 Several philosophical perspectives have been used to explain what (if anything) is wrong with insider trading. A first perspective invokes the concept of fair play. Even in a situation with fully autonomous traders, the argument goes, market transactions are not fair if one party has access to information that the other has not. Fair play requires a “level playing field”, i.e., that no participant starts from an unfairly advantaged position (Werhane 1989, 1991). However, critics argue that this perspective imposes excessive demands of informational equality. There are many asymmetries of information in the market that are seemingly unproblematic, e.g., that an antiquary knows more about antiques than his or her customers (Lawson 1988, Machan 1996). So might it be the inaccessibility of inside information that is problematic? But against this, one could argue that, in principle, outsiders have the possibility to become insiders and thus to obtain the exact same information (Lawson 1988, Moore 1990).