TRANSPOSITION ERROR is the unintentional exchange of two elements of an ordered list with all others staying the same. A transposition is therefore a permutation of two elements. For example, the swapping of 2 and 5 to take the list 123456 to 153426 is a transposition. In this example, if the newly ordered list of 153426 was unintentional, it would be commonly called a transposition error. In accounting, an error in copying a number from one place to another is a transposition error.
EXTENSION RISK, with mortgage-backed securities, is the risk that rising interest rates will slow the prepayment of underlying mortgages and extend the maturity.
COMMODITY is an article of commerce or product that can be used for commerce. In a narrower sense, commodity is product traded on an authorized commodity exchange. Some types of commodities: agricultural products, metals, petroleum, foreign currencies, financial instruments and indices, etc.
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