Derivatives are financial instruments whose value is derived from underlying assets like stocks, bonds, and commodities. While derivatives can be used to transfer risk between parties, they are often traded over-the-counter without oversight of pricing or adequate consideration of counterparty risk. This can allow large speculative positions to be built using leverage, and losses incurred due to inefficient management, misunderstanding of market risk, and hard-to-value securities. Examples of risks include the bankruptcy of Long-Term Capital Management and Allied Irish Bank, as well as losses incurred from mortgage-backed securities.