SUPPLANT is to take the place of or move into the position of, e.g. the computer supplanted the slide rule.
AGENCIES is securities issued by various agencies of the U.S. Government, such as the Federal National Mortgage Association.
WHEN-ISSUED, in securities, is a transaction made conditionally because a security, although authorized, has not yet been issued, e.g, new issues of stocks or bonds, stocks that have been split and Treasury securities are all traded on a when-issued basis.
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