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Indexation : ウィキペディア英語版
Indexation

Indexation is a technique to adjust income payments by means of a price index, in order to maintain the purchasing power of the public after inflation, while Deindexation refers to the unwinding of indexation.
From a macroeconomics standpoint there are four main categories of indexation: wage indexation, financial instruments rate indexation, tax rate indexation, and exchange rate indexation. The first three are indexed to inflation. The last one is typically indexed to a foreign currency mainly the US dollar. Any of these different types of indexation can be reversed (deindexation).
Applying a cost-of-living escalation COLA clause to a stream of periodic payments protects the real value of those payments and effectively transfers the risk of inflation from the payee to the payor, who must pay more each year to reflect the increases in prices. Thus, inflation indexation is often applied to pension payments, rents and other situations which are not subject to regular re-pricing in the market.
COLA is not CPI, which is an aggregate indicator. Using CPI as a COLA salary adjustment for taxable income fails to recognize that increases are generally taxed at the highest marginal tax rate whereas an individual's rising costs are paid with after-tax dollars - dollars commensurate with an individual's average after-tax level. Indexing tax brackets does not address this fundamental issue but it does effectively eliminate "bracket-creep".

Indexation has been very important in high-inflation environments, and was known as monetary correction "correção monetária" in Brazil from 1964 to 1994. Some countries have cut back significantly in the use of indexation and cost-of-living escalation clauses, first by applying only partial protection for price increases and eventually eliminating such protection altogether when inflation is brought down to single digits.
Protecting one of the parties from the risk of inflation means that the price risk must be shifted to another party. For example, if state pensions are adjusted for inflation, the price risk is passed from the pensioners to the taxpayers.
==Indexation of wages==
When a government decides to index wages of government employees to inflation it is to transfer the risk of inflation away from government workers onto the government. Such a policy is to attempt to reduce inflationary expectation and in turn inflation when it is rising rapidly. Research by economists is ambivalent on the success of such policies. Some have deemed it a success including Friedman (1974), Gray (1976), and Fischer (1977). Others have considered it less successful as they observed that indexation breeds inflation inertia (a reduction in the government and the central bank’s effort in fighting inflation leading to inflation rate remaining higher than targeted). This perspective is supported by Bonomo and Garcia (1994).
The economists diverging opinions on the merit of indexation often depend on what data they looked at. A given country over a specific time series may have been successful conducting indexation. While another country at another time may have been less successful. Some economists believe there are appropriate times for indexation (when inflation is really high) and times for deindexation (when inflation has moderated after indexation, but remains still too high vs the central bank’s inflation target).
In recent years Brazil, Chile, Israel, and Mexico have implemented successful inflation fighting campaigns by implementing the deindexation of wages (Lefort and Schmidt-Hebbel, 2002).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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