 Probably the most well-known ethical problem concerning fairness in finance, and also perhaps the one on which philosophers most disagree, is so-called insider trading. Put simply, this occurs when an agent uses his or her position within, or privileged information about, a company to buy or sell its shares (or other related financial assets) at favorable times and prices. For example, a CEO may buy shares in his or her company just before it announces a major increase in earnings that will boost the share price. While there is no fraud or breach of fiduciary duty, the agent seems to be exploiting an asymmetry of information.