Investors' ability to make such judgments is enhanced by giving them information about how the central bank sees the probable evolution of the economy in the foreseeable future, in part so that market participants can better judge the likely evolution of monetary policy.
Both derive their worth from the trust that the citizens of a country have in the country’s currency. The confidence that South Africans have in banknotes and coin is based on trust that the banknotes and coin are authentic, and trust in the institution that issues them.