Important legal information about the email you will be sending. By using this service, you agree to input your real email address and only send it to people you know. It is a violation of law in some jurisdictions to falsely identify yourself in an email. All information you provide will be used by Fidelity solely for the purpose of sending the email on your behalf. The subject line of the email you send will be "Fidelity.com: " What Is Equity and Examples?
Behaviorists argue that investors often behave irrationally when making investment decisions thereby incorrectly pricing securities, which causes market inefficiencies, which, in turn, are opportunities to make money. However, the whole notion of EMH is that these non-rational reactions to information cancel out, leaving the prices of stocks rationally determined.
Financial innovation has brought many new financial instruments whose pay-offs or values depend on the prices of stocks. Some examples are exchange-traded funds (ETFs), stock index and stock options, equity swaps, single-stock futures, and stock index futures. These last two may be traded on futures exchanges (which are distinct from stock exchanges—their history traces back to commodity futures exchanges), or traded over-the-counter. As all of these products are only derived from stocks, they are sometimes considered to be traded in a (hypothetical) derivatives market, rather than the (hypothetical) stock market.