Monday, June 9, 2008






Causes of inflation


A great deal of economic literature concerns the question of what causes inflation and what effect it has. There are different schools of thought as to what causes inflation. Most can be divided into two broad areas: quality theories of inflation, and quantity theories of inflation. Many theories of inflation combine the two. The quality theory of inflation rests on the expectation of a seller accepting currency to be able to exchange that currency at a later time for goods that are desirable as a buyer. The quantity theory of inflation rests on the equation of the money supply, its velocity, and exchanges. Adam Smith and David Hume proposed a quantity theory of inflation for money, and a quality theory of inflation for production.

Keynesian economic theory proposes that money is transparent to real forces in the economy, and that visible inflation is the result of pressures in the economy expressing themselves in prices.


  • Demand-pull inflation: inflation caused by increases in aggregate demand due to increased private and government spending, etc. Demand inflation is constructive to a faster rate of economic growth since the excess demand and favourable market conditions will stimulate investment and expansion. The failing value of money, however, may encourage spending rather than saving and so reduce the funds available for investment.

A major demand-pull theory centers on the supply of money: inflation may be caused by an increase in the quantity of money in circulation relative to the ability of the economy to supply (its potential output). This is most obvious when governments finance spending in a crisis, such as a civil war, by printing money excessively, often leading to hyperinflation, a condition where prices can double in a month or less. Another cause can be a rapid decline in the demand for money, as happened in Europe during the Black Plague.

The money supply is also thought to play a major role in determining moderate levels of inflation, although there are differences of opinion on how important it is. For example, Monetarist economists believe that the link is very strong; Keynesian economics, by contrast, typically emphasize the role of aggregate demand in the economy rather than the money supply in determining inflation. That is, for Keynesians the money supply is only one determinant of aggregate demand. Some economists consider this a 'hocus pocus' approach: They disagree with the notion that central banks control the money supply, arguing that central banks have little control because the money supply adapts to the demand for bank credit issued by commercial banks. This is the theory of endogenous money. Advocated strongly by post-Keynesians as far back as the 1960s, it has today become a central focus of Taylor rule advocates. But this position is not universally accepted. Banks create money by making loans. But the aggregate volume of these loans diminishes as real interest rates increase. Thus, it is quite likely that central banks influence the money supply by making money cheaper or more expensive, and thus increasing or decreasing its production.





Effects of inflation

A small amount of inflation can be viewed as having a beneficial effect on the economy.[3] One reason for this is that it can be difficult to renegotiate prices and wages. With generally increasing prices it is easier for relative prices to adjust.

Many prices are "sticky downward" and tend to creep upward, so that efforts to attain a zero inflation rate (a constant price level) punish other sectors with falling prices, profits, and employment. Efforts to attain complete price stability can also lead to deflation, which is generally viewed as a negative by Keynesians because of the downward adjustments in wages and output that are associated with it.

With inflation, the price of any given good is likely to increase over time, therefore both consumers and businesses may choose to make purchases sooner rather than later. This effect tends to keep an economy active in the short term by encouraging spending and borrowing, and in the long term by encouraging investments. But inflation can also reduce incentives to save, so the effect on gross capital formation in the long run is ambiguous.

Inflation is also viewed as a hidden risk pressure that provides an incentive for those with savings to invest them, rather than have the purchasing power of those savings erode through inflation. In investing, inflation risks often cause investors to take on more systematic risk, in order to gain returns that will stay ahead of expected inflation.[citation needed]

Inflation also gives central banks room to maneuver, since their primary tool for controlling the money supply and velocity of money is by setting the lowest interest rate in an economy - the discount rate at which banks can borrow from the central bank. Since borrowing at negative interest is generally ineffective, a positive inflation rate gives central bankers "ammunition", as it is sometimes called, to stimulate the economy. As central banks are controlled by governments, there is also often political pressure to increase the money supply to pay government services, this has the added effect of creating inflation and decreasing the net money owed by the government in previously negotiated contractual agreements and in debt.

For these reasons, many economists see moderate inflation as a benefit; some business executives see mild inflation as "greasing the wheels of commerce."[4][5] But other economists have advocated reducing inflation to zero as a monetary policy goal - particularly in the late 1990s at the end of a long disinflationary period, when the policy seemed within reach; and some have even advocated deflation instead of inflation.

In general, high or unpredictable inflation rates are regarded as bad:

  • Uncertainty about future inflation may discourage investment and saving.
  • Redistribution
    • Rent Seeking - happens when resources are used to merely transfer wealth rather than produce it. e.g. a company tries to gauge and combat the costs of inflation.
    • Debtors may be helped by inflation due to reduction of the real value of debt burden.
    • A particular form of inflation as a tax is Bracket Creep (also called fiscal drag). By allowing inflation to move upwards, certain sticky aspects of the tax code are met by more and more people. For example, income tax brackets, where the next dollar of income is taxed at a higher rate than previous dollars, tend to become distorted. Governments that allow inflation to "bump" people over these thresholds are, in effect, allowing a tax increase because the same real purchasing power is being taxed at a higher rate.
  • International trade: Where fixed exchange rates are imposed, higher inflation than in trading partners' economies will make exports more expensive and tend toward a weakening balance of trade.
  • Rising inflation can prompt trade unions to demand higher wages, to keep up with consumer prices. Rising wages in turn can help fuel inflation. In the case of collective bargaining, wages will be set as a factor of price expectations, which will be higher when inflation has an upward trend. This can cause a wage spiral.[citation needed] In a sense, inflation begets further inflationary expectations.
  • Hoarding: people buy consumer durables as stores of wealth in the absence of viable alternatives as a means of getting rid of excess cash before it is devalued, creating shortages of the hoarded objects.

Measures of inflation

Inflation is measured by calculating the percentage rate of change of a price index, which is called the inflation rate. This rate can be calculated for many different price indices, including:

  • Consumer price indices (CPIs) which measure the price of a selection of goods purchased by a "typical consumer." In the UK, an alternative index called the Retail Price Index (RPI) uses a slightly different market basket.
  • Cost-of-living indices (COLI) are indices similar to the CPI which are often used to adjust fixed incomes and contractual incomes to maintain the real value of those incomes.
  • The GDP Deflator is a measure of the price of all the goods and services included in Gross Domestic Product (GDP). The US Commerce Department publishes a deflator series for US GDP, defined as its nominal GDP measure divided by its real GDP measure.
  • Capital goods price Index, although so far no attempt at building such an index has been made, several economists have recently pointed out the necessity of measuring capital goods inflation (inflation in the price of stocks, real estate, and other assets) separately.[citation needed] Indeed a given increase in the supply of money can lead to a rise in inflation (consumption goods inflation) and or to a rise in capital goods price inflation. The growth in money supply has remained fairly constant through since the 1970s however consumption goods price inflation has been reduced because most of the inflation has happened in the capital goods prices.

Other types of inflation measures include:



Inflation is a rise in general level of prices of goods and services over time. Although "inflation" is sometimes used to refer to a rise in the prices of a specific set of goods or services, a rise in prices of one set (such as food) without a rise in others (such as wages) is not included in the original meaning of the word. Inflation can be thought of as a decrease in the value of the unit of currency. It is measured as the percentage rate of change of a price index[1] but it is not uniquely defined because there are various price indices that can be used.

Many economists believe that high rates of inflation are caused by high rates of growth of the money supply.[2] Views on the factors that determine moderate rates of inflation are more varied: changes in inflation are sometimes attributed to fluctuations in real demand for goods and services or in available supplies (i.e. changes in scarcity), and sometimes to changes in the supply or demand for money. In the mid-twentieth century, two camps disagreed strongly on the main causes of inflation at moderate rates: the "monetarists" argued that money supply dominated all other factors in determining inflation, while "Keynesians" argued that real demand was often more important than changes in the money supply.

There are many measures of inflation. For example, different price indices can be used to measure changes in prices that affect different people. Two widely known indices for which inflation rates are reported in many countries are the Consumer Price Index (CPI), which measures consumer prices, and the GDP deflator, which measures price variations associated with domestic production of goods and services.