"Some of their functions are identical to the functions of regular, commercial banks. Other functions are unique to the central bank. On certain functions it has an absolute legal monopoly. Central banks take deposits from other banks and, in certain cases, from foreign governments which deposit their foreign exchange and gold reserves for safekeeping (for instance, with the Federal Reserve Bank of the USA). The Central Bank invests the foreign exchange reserves of the country while trying to maintain an investment portfolio similar to the trade composition of its client - the state. The Central bank also holds onto the gold reserves of the country. Most central banks have lately tried to get rid of their gold, due to its ever declining prices. Since the gold is registered in their books in historical values, central banks are showing a handsome profit on this line of activity. Central banks (especially the American one) also participate in important, international negotiations. If they do not do so directly - they exert influence behind the scenes. The German Bundesbank virtually dictated Germany's position in the negotiations leading to the Maastricht treaty. It forced the hands of its co-signatories to agree to strict terms of accession into the Euro single currency project. The Bunbdesbank demanded that a country's economy be totally stable (low debt ratios, low inflation) before it is accepted as part of the Euro. It is an irony of history that Germany itself is not eligible under these criteria and cannot be accepted as a member in the club whose rules it has assisted to formulate. The main function of a modern central bank is the monitoring and regulation of interest rates in the economy. The central bank does this by changing the interest rates that it charges on money that it lends to the banking system through its "discount windows". Interest rates is supposed to influence the level of economic activity in the economy. This supposed link has not unequivocally proven by economic research. Also, there usually is a delay between the alteration of interest rates and the foreseen impact on the economy. This makes assessment of the interest rate policy difficult. Still, central banks use interest rates to fine tune the economy. Higher interest rates - lower economic activity and lower inflation. The reverse is also supposed to be true. Even shifts of a quarter of a percentage point are sufficient to send the stock exchanges tumbling together with the bond markets. In 1994 a long term trend of increase in interest rate commenced in the USA, doubling interest rates from 3 to 6 percent. Investors in the bond markets lost 1 trillion (=1000 billion!) USD in 1 year. Even today, currency traders all around the world dread the decisions of the Bundesbank and sit with their eyes glued to the trading screen on days in which announcements are expected. Interest rates is only the latest fad. Prior to this - and under the influence of the Chicago school of economics - central banks used to monitor and manipulate money supply aggregates. Simply put, they would sell bonds to the public (and, thus absorb liquid means, money) - or buy from the public (and, thus, inject liquidity). Otherwise, they would restrict the amount of printed money and limit the government's ability to borrow. Even prior to that fashion there was a widespread belief in the effectiveness of manipulating exchange rates. This was especially true where exchange controls were still being implemented and the currency was not fully convertible. Britain removed its exchange controls only as late as 1979. The USD was pegged to a (gold) standard (and, thus not really freely tradable) as late as 1971. Free flows of currencies are a relatively new thing and their long absence reflects this wide held superstition of central banks. Nowadays, exchange rates are considered to be a "soft" monetary instrument and are rarely used by central banks. The latter continue, though, to intervene in the trading of currencies in the international and domestic markets usually to no avail and while losing their credibility in the process. Ever since the ignominious failure in implementing the infamous Louvre accord in 1985 currency intervention is considered to be a somewhat rusty relic of old ways of thinking. Central banks are heavily enmeshed in the very fabric of the commercial banking system. They perform certain indispensable services for the latter. In most countries, interbank payments pass through the central bank or through a clearing organ which is somehow linked or reports to the central bank. All major foreign exchange transactions pass through - and, in many countries, still must be approved by - the central bank. Central banks regulate banks, licence their owners, supervise their operations, keenly observes their liquidity. The central bank is the lender of last resort in cases of insolvency or illiquidity". http://samvak.tripod.com/nm018.html

what are the functions of a treasury?