Elanso

Fortunately, the man for the job is right at hand when the hereditary chief of the Royal Bank goes to her reward: Moist von Lipwig, triumphant in turning around the Post Office in Going Postal, is persuaded (Lord Vetinari can be very persuasive, especially to civil servants he has already once hanged by the neck) to take the second-in-command position at the Bank, the Chairman's office having been assumed by Mr. Fusspot, a small dog who lives in the in-box on Lipwig's desk.

Moist soon finds himself introducing paper money, coping with problems in the gold vault, dealing with a model of the economy which may be more than a model (giving an entirely new meaning to “liquidity”), fending off a run on the bank, summoning the dead to gain control of a super-weapon, and finding a store of value which is better than gold. If you aren't into economics, this is a terrific Discworld novel; if you are, it's delightful on a deeper level.

The “Glooper” in the basement of the bank is based upon economist William Phillips's MONIAC hydraulic economic computer, of which a dozen or more were built. There is no evidence that fiddling with Phillips's device was able to influence the economy which it modelled, but perhaps this is because Phillips never had an assistant named “Igor”.

If you're new to Terry Pratchett and don't know where to start, here's a handy chart (home page and other language translations) which shows the main threads and their interconnections. Making Money does not appear in this map; it should be added to the right of Going Postal.