They are valued according to the gold/foreign currency reserves with which it is backed up. These reserves are kept by central bank and they are increased when issuing new notes.
Kuwaiti Dinar
Currency: Cash, banknotes, legal tender Money: Currency, cash, funds
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KUWAIT
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Highest valued currency is Kuwaiti Dinar. The latest updates are found in http://en.wikipedia.org/wiki/Highest_valued_currency_unit Mr.IK
Cash can be used as a noun meaning currency or as a verb meaning the act of transferring a form of non-liquid currency to liquid currency.
The Iranian Rial is currently the lowest-valued currency in the world.
money or cash
Your question is somewhat confusing.If you are asking which country in the world has the most valued and least valued currency, then they are:Kuwait - Kuwaiti Dinar (most)Somalia - Somali Shilling (least)If you are asking which island country in the world has the most valued and least valued currency, then they are:Bahrain - Bahraini Dinar (most)São Tomé and Príncipe - São Tomé and Príncipe Dobra (least)
That is the correct spelling of the noun "currency" (money, cash).
if cash is under valued then debit the cash with amount while if cash is overvalued the cash will be credited to reduce the balance.