Pegging

Commodities trading: Control by commodity exchanges of price fluctuations by tying the daily trading limits to the previous trading day's settlement (close) price.
Currency trading: Control of exchange rate fluctuations by a government through
(1) tying a currency's value to the value of a stronger currency,
(2) buying and selling own currency to increase or decrease its demand.
Securities trading: Manipulation of a new issue's market price by its underwriter through large purchases on the stockmarket. Similar manipulation of already issued securities is illegal.