Oil storage became big business in 2008 and 2009, when the supply glut in the oil market led to situation where oil futures were higher priced than their spot price. Many participants—including Wall Street giants, such as Morgan Stanley, Goldman Sachs, and Citicorp—turned sizeable profits simply by sitting on tanks of oil. Institutional investors bet on the future of oil prices through a financial instrument known as oil futures, in which investors contractually agree to buy or sell oil at a set date in the future. Investors can choose to take profits or losses prior to the oil-delivery date. Alternatively, they can leave the contract in place and take physical delivery of the oil at an "officially designated delivery point" in the United States; this delivery point is usually Cushing.