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People or organisations often enter into agreements to borrow something. Both parties must agree on some standard of deferred payment, most usually a sum of money denominated as units of a currency, but sometimes a like good. For instance, one may borrow shares, in which case, one may pay for them later with the shares, plus a premium for the borrowing privilege, or the sum of money required to buy them in the market at that time.
There are numerous types of debt obligations. They include loans, bonds, mortgages, promisary notes, and debentures. It is very common to borrow large sums for major purchases, such as a mortgage, and pay it back with an agreed premium interest rate over time, or all at once at a later date. The amount of money outstanding is usually called a debt. The debt will increase through time if it is not repaid faster than it grows. In some systems of economics this effect is termed usury, in others, the term "usury" refers only to an excessive rate of interest, in excess of a reasonable profit for the risk accepted.
As noted above, debt is normally denominated in a particular monetary currency, and so changes in the valuation of that currency can change the effective size of the debt. This can happen due to inflation or deflation, so it can happen even though the borrower and the lender are using the same currency. Thus it is important to agree on standards of deferred payment in advance, so that a degree of fluctuation will also be agreed as acceptable. It is for instance common to agree to " US dollar denominated" debt.
The form of debt involved in banking gives rise to a large proportion of the money in most industrialised nations (see money and credit moneyCredit money is money that is backed by a promise to pay made by someone other than the state. Examples of credit money include bank deposits and credit card loans. During the Crusades in Europe, precious goods would be entrusted to the Catholic Church's for a discussion of this). There is therefore a complex relationship between inflation, deflation, the money supply, and debt. The store of value represented by the entire economy of the industrialized nation itself, and the state's ability to levy tax on it, acts to the foreign holder of debt as a guarantee of repayment, since industrial goods are in high demand in many places worldwide.
Lendings to stable financial entities such as large companies or governments are often termed "risk free" or "low risk" and made at a so-called " risk free interest rate". This is because the debt and interest are highly likely to be repaid. However, if the value of a currency has changed in the meantime, the purchasing power of the money repaid may vary considerably from that which was expected at the commencement of the loan. So from a practical investment point of view, there is still considerable risk attached to "risk free" or "low risk" lendings, even though in terms of the amount of a currency that will be returned there may not be. The Bank for International Settlements is an entity that sets rules to define what loans qualify as "risk free" or not. It is a very powerful institution, formed by the Bretton Woods agreements, which has had a pivotal position in central banking since 1947 when it opened.