Monetization (also spelled monetisation) is, broadly speaking, the process of converting something into money. The term has a broad range of uses. In banking, the term refers to the process of converting or establishing something into legal tender. While it usually refers to the coining of currency or the printing of banknotes by central banks, it may also take the form of a promissory currency. The term "monetization" may also be used informally to refer to exchanging possessions for cash or cash equivalents, including selling a security interest, charging fees for something that used to be free, or attempting to make money on goods or services that were previously unprofitable or had been considered to have the potential to earn profits. And data monetization refers to a spectrum of ways information assets can be converted into economic value. Another meaning of "monetization" denotes the process by which the U.S. Treasury accounts for the face value of outstanding coinage. This procedure can extend even to one-of-a-kind situations such as when the Treasury Department sold an extremely rare 1933 Double Eagle. The coin's nominal value of $20 was added to the final sale price, reflecting the fact that the coin was considered to have been issued into circulation as a result of the transaction. In some industry sectors such as high technology and marketing, monetization is a buzzword for adapting non-revenue-generating assets to generate revenue. Promissory currency Such commodities as gold, diamonds, and emeralds have generally been regarded by human populations as having an intrinsic value within that population based on their rarity or quality and thus provide a premium not associated with fiat currency unless that currency is "promissory". That is, the currency promises to deliver a given amount of a recognized commodity of a universally (globally) agreed-to rarity and value, providing the currency with the foundation of legitimacy or value. Though rarely the case with paper currency, even intrinsically relatively worthless items or commodities can be made into money, so long as they are challenging to make or acquire. Debt monetization Debt monetization is the financing of government spending by the central bank. If a nation's expenditure exceeds its revenues, it incurs a government deficit which can be financed either: by the government treasury, by way of money it already holds (e.g. income or liquidations from a sovereign wealth fund); or issuing new bonds; or by the central bank, through