Inflation

This article is about the economic concept of inflation. For the cosmological concept, see cosmic inflation.

In economics, inflation is a rise in the aggregate money supply. Inflation effectuates the decline in purchasing power of money relative to some basket of goods and services. In some models of economics, this is equivalent to a fall in the demand for, or an increase in the supply of money. Inflation is the opposite of deflation. It is a common misconception that inflation is a rise in consumer prices.

In recent history, many economists have begun to view inflation in terms of it's effects. For example, the CPI is commonly used to gauge inflation but is,in fact, a measure of its effects. Historically, the word "inflation" is used to mean an increase in the money supply. Thus, for example, some observers of the 1920s in the United States refer to "inflation" even though prices were not increasing at the time.

Related terms are disinflation which is a reduction in the rate of inflation, or an effect which reduces inflationary pressures, deflation which is a fall in the general level of prices, reflation which is the use of stimulus to reverse deflation, hyperinflation which is a rapid period of inflation without tendency to equilibrium. Low levels of inflation, between 0% and 2% are sometimes called "price stability", and many central banks officially or unofficially have inflation targeting to maintain some preferred measure of inflation within this range.

(See also macro-economics, monetary policy and money supply)

Measuring inflation

The effects of inflation can be measured by observing the change in the price of a large number of goods and services in an economy, usually based on data collected by government agencies. The prices of goods and services are combined to give a price index or average price level, the average price of the basket of products. The inflation rate is the rate of increase in this index; while the price level might be seen as measuring the size of a balloon, inflation refers to the increase in its size.

Examples of common measures of inflation's effects include:

• consumer price indexes (CPIs) which measure the price of a selection of goods purchased by a "typical consumer". In many industrial nations, annualised percentage changes in these indexes are the most commonly reported inflation figure. These measures are often used in wage and salary negotiations, since employees wish to have (nominal) pay raises that equal or exceed the rate of increase of the CPI. Sometimes, labor contracts include cost of living escalators (or adjustments) that imply nominal pay raises automatically occur with inflation, usually at a slower rate than actual inflation (and after inflation has occurred).

• producer price indexes (PPIs) which measure the price received by a producer. This differs from the CPI in that price subsidation, profits, and taxes may cause the amount received by the producer to differ from what the consumer paid. There is also typically a delay between an increase in the PPI and any resulting increase in the CPI. Producer price inflation measures the pressure being put on producers by the costs of their raw materials. This could be "passed on" as consumer inflation, or it could be absorbed by profits, or offset by increasing productivity.

• wholesale price indexes which measure the change in price of a selection of goods at wholesale (i.e., typically prior to sales taxes). These are very similar to the PPI.

• commodity price indexes which measure the change in price of a selection of commodities. In the present commodity price indexes are weighted by the relative importance of the components to production. However, single commodity indexes, or limited baskets are used as a monetary base, for example in the case of the gold standard the sole commodity used was gold.

• GDP deflator which is based on calculations of the gross domestic product: it is based on the ratio of the total amount of money spent on GDP (nominal GDP) to the inflation-corrected measure of GDP (constant-price or "real" GDP). (See real vs. nominal in economics.) It is the broadest measure of the price level. Deflators are also calculated for components of GDP such as personal consumption expenditure.

• Employment Cost Index related to PPI and WPI is an index of the costs of employing labor. The ECI measures wages, benefits, and the other costs of maintaining a worker. In Britain this is sometimes called the "all in" cost of an employee.

Inflation measures are often modified over time, either for the relative weight of goods in the basket, or in the way in which goods from the present are compared with goods from the past. This includes hedonic adjustments and "reweighting" as well as using chained measures of inflation. As with many economic numbers, inflation numbers are often seasonally adjusted in order to differentiate expected cyclical cost increases, versus changes in the economy. Inflation numbers are averaged or otherwise subjected to statistical techniques in order to remove statistical noise and volatility of individual prices. Finally, when looking at inflation, economic institutions sometimes only look at subsets or "special indexes". One common set is inflation ex-food and energy, which is often called "core inflation".

The role of inflation in the economy

A great deal of economic literature concerns the question of what causes inflation and what effects it has. A small amount of inflation is often viewed as having a positive effect on the economy. One reason for this is that it is difficult to renegotiate some prices, and particularly wages, downwards, so that 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 (steadily falling prices), which can be very destructive.

Inflation is also viewed as a hidden risk pressure which 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 which will stay ahead of expected inflation. Inflation is also used as an index for cost of living adjustments and as a peg for some bonds. In effect, inflation is the rate at which previous economic transactions are discounted economically.

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.

However, in general, inflation rates above the nominal amounts required to give monetary freedom, and investing incentive, are regarded as negative, particularly because in current economic theory, inflation begets further inflationary expectations.

• Increasing uncertainty may discourage investment and saving.
• Redistribution
  • It will redistribute income from those on fixed incomes, such as pensioners, and shifts it to those who draw a variable income, for example from wages and profits which may keep pace with inflation.
  • Similarly it will redistribute wealth from those who lend a fixed amount of money to those who borrow. For example, where the government is a net debtor, as is usually the case, it will reduce this debt redistributing money towards the government. Thus inflation is sometimes viewed as similar to a hidden tax.
• International trade: If the rate of inflation is higher than that abroad, a fixed exchange rate will be undermined through a weakening balance of trade.
• Shoe leather costs: Because the value of cash is eroded by inflation, people will tend to hold less cash during times of inflation. This imposes real costs, for example in more frequent trips to the bank. (The term is a humorous reference to the cost of replacing shoe leather worn out when walking to the bank.)
• Menu costs: Firms must change their prices more frequently, which imposes costs, for example with restaurants having to reprint menus.
• Relative Price Distortions: Firms do not generally synchronize adjustment in prices. If there is higher inflation, firms that do not adjust their prices will have much lower prices relative to firms that do adjust them. This will distort economic decisions, since relative prices will not be reflecting relative scarcity of different goods.
• hyperinflation: if inflation gets totally out of control (in the upward direction), it can grossly interfere with the normal workings of the economy, hurting its ability to supply.
• inflation tax when a government can improve its net financial position by allowing inflation, then this represents a tax on certain holders of currency. Governments may decide to use this "stealth tax" in order to avoid hard fiscal decisions to cut expenditures, raise taxes, or confront government unions with greater efficiency.
• Bracket Creep is related to the inflation tax. By allowing inflation to move upwards, certain sticky aspects of the tax code are met by more and more people. Commonly income tax brackets, where the next dollar of income is taxed at a higher rate than previous dollars. Governments which 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.

As noted, some economists see moderate inflation as a benefit; some business executives see mild inflation as "greasing the wheels of commerce." A very few economists have advocated reducing inflation to zero as a monetary policy goal - particularly in the late 1990's at the end of a long disinflationary period, when the policy seemed within reach.

Causes of inflation

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 buyer 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 Theory

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.

There are three major types of inflation, as part of what Robert J. Gordon calls the "triangle model":

• Demand pull inflation -- inflation due to high demand for goods and low unemployment.
• Cost push inflation -- nowadays termed "supply shock inflation," due to an event such as a sudden decrease in the supply of oil.
• Built-in inflation -- induced by adaptive expectations, often linked to the "price/wage spiral" because it involves workers trying to keep their wages up with prices and then employers passing higher costs on to consumers as higher prices as part of a "vicious circle." Built-in inflation reflects events in the past, and so might be seen as hangover inflation.

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 has been seen most graphically when governments have financed spending in a crisis by printing money excessively (say, due to war or civil war conditions), often leading to hyperinflation where prices rise at extremely high rates (say, doubling every month). 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 levels of more 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.

A fundamental concept in such Keynesian analysis is the relationship between inflation and unemployment, called the Phillips curve. This model suggested that price stability was a trade off against employment. Therefore some level of inflation could be considered desirable in order to minimize unemployment. The Philips curve model described the US experience well in the 1960s, but failed to describe the combination of rising inflation and economic stagnation (sometimes referred to as stagflation) experienced in the 1970s.

Thus, modern macroeconomics describes inflation using a Phillips curve that shifts (so the trade-off between inflation and unemployment changes) due to such matters as supply shocks and inflation becoming built into the normal workings of the economy. The former refers to such events as the oil shocks of the 1970s, while the latter refers to the price/wage spiral and inflationary expectations implying that the economy "normally" suffers from inflation. Thus, the Phillips curve represents only the demand-pull component of the triangle model.

Another Keynesian concept is the potential output (sometimes called the "natural gross domestic product"), a level of GDP where the economy is at its optimal level of production, given institutional and natural constraints. (This level of output corresponds to the NAIRU or the "natural" rate of unemployment or the full-employment unemployment rate.) If GDP exceeds its potential (and unemployment is below the NAIRU), the theory says that inflation will accelerate as suppliers increase their prices and built-in inflation worsens. If GDP falls below its potential level (and unemployment is above the NAIRU), inflation will decelerate as suppliers attempt to fill excess capacity, cutting prices and undermining built-in inflation.

However, one problem with this theory for policy-making purposes is that the exact level of potential output (and of the NAIRU) is generally unknown and tends to change over time. Inflation also seems to act in an asymmetric way, rising more quickly than it falls. Worse, it can change due to policy: for example, high unemployment under Prime Minister Margaret Thatcher in the UK may have led to a rise in the NAIRU (and a fall in potential) because many of the unemployed found themselves as structurally unemployed, unable to find jobs that fit their skills in the British economy. A rise in structural unemployment implies that a smaller percentage of the labor force can find jobs at the NAIRU, where the economy avoids crossing the threshold into the realm of accelerating inflation.

Monetarism

One of the most influential schools of economic thinking rests on a quantity theory of money, namely monetarism. Monetarists assert that empirical study of monetary history shows that "inflation is always and everywhere a monetary phenomenon". Modern mainstream central bank practice until recently adhered closely to this concept.

Other schools of quantity theory include the Austrian economists) who claim that the only cause of inflation is the increase of the money supply relative to the output of the economy.1 These economists outright reject the theories behind cost push inflation, wage push inflation and other common theories of inflation.

These economists derive this belief from what is known as the |Quantity Theory of Money. The Quantity Theory of Money, simply stated is that the total amount of spending in an economy is primarily determined by the total amount of money in existence. From this theory the following formula is created:

$P={\frac {D_{C}}{S_{C}}}$

$P$ is the general price level of consumers' goods, $D_{C}$ is the aggregate demand for consumers' goods and $S_{C}$ is the aggregate supply of consumers' goods. The idea behind this formula is that the general price level of consumers' goods will rise only if the aggregate supply of consumers' goods goes down relative to the aggregate demand for consumers' goods, or if the aggregate demand increases relative to the aggregate supply of consumers' goods. Based on the idea that total spending is based primarily on the total amount of money in existence, the economists calculate aggregate demand for consumers' goods based on the total quantity of money. Therefore, they posit that as the quantity of money increases, total spending increases and the aggregate demand for consumers' goods increases as well. For this reason the economists who believe in the Quantity Theory of Money also believe that the only cause for rising prices in a growing economy (this means aggregate supply of consumers' goods is increasing), is an increase of the total quantity of money in existence, which is caused by monetary policies, generally of central banks where there is a monopoly on currency issue and the lack of a commodity peg to currency. The central bank of the United States is the Federal Reserve, the central bank backing the euro is the European Central Bank.

Rational Expectations

Rational expectations, or "rashex" is a view of macro-economics which states that economic actors look into the future and try and maximize their general sense of future states of well being, and do not simply respond to the immediate opportunity cost and pressures of the present. In this view, while generally grounded in monetarism, future expectations and strategies are important for inflation as well.

One core assertion of rashex is that actors will seek to "head off" central bank decisions, by preëmptively engaging in inflationary behavior. This means that central banks must establish their credibility in fighting inflation, or have economic actors make bets that the economy will expand, believing that the central bank will expand the money supply rather than allow a recession which would be very damaging to the economy, and possibly require government bailouts. In this view central banks might be at an advantage renouncing some flexibility of monetary policy, in order to persuade economic actors that the central bank will not allow inflation.

Other theories

Supply-side economics asserts that inflation is always caused by either an increase in the supply of money or a decrease in the demand for money. The value of money is seen as being purely subject to these two factors. Thus the inflation experienced during the Black Plague in medieval Europe is seen as being caused by a decrease in the demand for money (the money stock used was gold coin and it was relatively fixed), whilst the inflation of the 1970s is regarded as being initially caused by an increased supply of money that occurred following the US exit from the Bretton Woods gold standard. Supply-side economics asserts that the money supply can grow without causing inflation as long as the demand for money also grows.

In Karl Marx' theory of money, gold was the ultimate intrinsic store of value, and therefore the measure of all other forms of value. In Marxist economic theory, value is based on the labor required to extract a given commodity versus the demand for that commodity by those with money. The fluctuations of price in money terms are inconsequential compared to the rise and fall of the labor cost of a commodity, since this determines the true cost of a good or service. In this Marxist economics is related to other "classical" economic theories which argue that monetary inflation is caused solely by printing notes in excess of the basic quantity of gold. However, Marx argues that the real kind of inflation is in the cost of production measured in labor. Because of the classical labor theory of value, the only factor which is important is whether more or less labor is required to produce a given commodity at the rate it is demanded.

Within the context of a fixed specie basis for money, one important controversy was between the "Quantity Theory" of money and the Real Bills Doctrine. Within this context, quantity theory applies to the level of fractional reserve accounting allowed against specie, generally gold, held by a bank. The RBD argues that banks should also be able to issue currency against bills of trading, that is "real bills" that they buy from merchants. This theory was important in the 19th century in debates between "Banking" and "Currency" schools of monetary soundness, and in the formation of the Federal Reserve. In the wake of the collapse of the international gold standard post 1913, and the move towards deficit financing of government, RBD has remained a minor topic, primarily of interest in limited contexts, such as currency boards. It is generally held in ill repute today, with Mishkin going so far as to say it had been "completely discreditted." Even so, it has theoretical support from a few economists, particularly those that see restrictions on a particular class of credit as incompatible with libertarian principles of laissez-faire, even though almost all libertarian economists are opposed to the RBD.

Stopping inflation

There are a number of methods which have been suggested to stop inflation. Central Banks such as the U.S. Federal Reserve can affect inflation to a significant extent through setting interest rates and through other operations (i.e., using monetary policy). High interest rates (and slow growth of the money supply) are the traditional way that Central Banks fight inflation, using unemployment and the decline of production to prevent price increases.

However, Central Banks view the means of controlling the inflation differently. For instance, some follow a symmetrical inflation target while others only control inflation when it rises above a target, whether express or implied.

Monetarists emphasize increasing interest rates (reducing the money supply, monetary policy) to fight inflation. Keynesians emphasize reducing demand in general, often through fiscal policy, using increased taxation or reduced government spending to reduce demand as well as by using monetary policy. Supply-side economists advocate fighting inflation by fixing the exchange rate between the currency and some reference currency such as gold. This would be a return to the gold standard. All of these policies are achieved in practice through a process of open market operations.

Another method attempted is simply instituting wage and price controls ("incomes policies'). Wage and price controls have been successful in wartime environments in combination with rationing. However, their use in other contexts is far more mixed. Notable failures of their use include the 1972 imposition of wage and price controls by Richard Nixon. In general wage and price controls are regarded as a drastic measure, and only effective when coupled with policies designed to reduce the underlying causes of inflation during the wage and price control regime, for example, winning the war being fought. Many developed nations set prices extensively, including for basic commodities as gasoline. The usual economic analysis is that that which is under priced is overconsumed, and that the distortions that occur will force adjustments in supply. For example, if the official price of bread is too low, there will be too little bread at official prices.

Temporary controls may complement a recession as a way to fight inflation: the controls make the recession more efficient as a way to fight inflation (reducing the need to increase unemployment), while the recession prevents the kinds of distortions that controls cause when demand is high. However, in general the advice of economists is not to impose price controls, but to liberalize prices, assuming that the economy will adjust, abandoing unprofitable economic activity. The lower activity will place fewer demands on whatever commodities were driving inflation, whether labor or resources, and inflation will fall with total economic output. This often produces a severe recession, as productive capacity is reallocated, and is thus often very unpopular with the people whose livelihoods are destroyed. (See Creative destruction)

See also

• Hyperinflation
• Stagflation
• Deflation
• Devaluation
• Central bank
• Macroeconomics
• Economics
• Phillips Curve
• Price revolution
• Rule of 72- a rule of thumb for calculating the period for inflation to halve the purchasing value of a fixed amount

References

[1] George Reisman, Capitalism: A Treatise on Economics (Ottawa : Jameson Books, 1990), 503-506 & Chapter 19 ISBN 0915463733 Mishkin, Frederic S., The Economics of Money, Banking, and Financial Markets, New York, Harper Collins, 1995.