<Dl> <Dd> Money's a matter of functions four, </Dd> <Dd> A Medium, a Measure, a Standard, a Store . </Dd> </Dl> <Dd> Money's a matter of functions four, </Dd> <Dd> A Medium, a Measure, a Standard, a Store . </Dd> <P> This couplet would later become widely popular in macroeconomics textbooks . Most modern textbooks now list only three functions, that of medium of exchange, unit of account, and store of value, not considering a standard of deferred payment as it is a distinguished function, but rather subsuming it in the others . </P>

Who introduced the concept of money in the region