Theories of Inflation and its Economic Consequences

Since it’s specifically difficult to identify the reasons for or factors that contribute to inflation, many theories and concepts have been introduced for this purpose. Each theory tries to clarify the supply and demand factors that result in the creation of an inflationary situation.

The main theories of inflation are as follows,

  • Quantity Theory of Money
  • Keynesian Theory
  • Monetarism
  • Structuralism

Quantity Theory of Money

This refers to the identical or equal relationship between national income estimated at market prices and the velocity of circulation of the money supply. Based on this theory, there is a positive relationship between price levels and the money supply. This relationship is presented using the quantity equation (MV=PY) which was observed previously under the study on money supply.


Where: M is the stock of money in circulation

V is the velocity of circulation

P is the general price level

Y is the total income.

Accordingly there will be a proportionate positive relationship between the money supply and the price levels of a given economy. That is, when the money supply increases by a certain percentage the price levels will also increase by an equal percentage.

According to this theory it is believed that inflation is caused by an expansion in the money supply of a given economy. It is under the view that inflationary situations caused due to an increase in money supply which is not followed by or supported by an increase in output levels of an economy.

Keynesian Theory

The Keynesian view on inflation initially introduced in a book titled The General Theory of Employment, Interest and Money published in 1940.

According to Keynes an increase in general price levels or inflation is created by an increase in the aggregate demand which is over and above the increase in aggregate supply. If a given economy is at its full employment output level, an increase in government expenditure (G), an increase in private consumption (C) and an increase in private investment (I) will create an increase in aggregate demand; Leading towards an increase in general price levels.

Such an inflationary situation is created due to the fact that at optimum or full employment of output (maximum utilization of scarce resources) a given economy is unable to increase its output or aggregate supply in response to an increase in aggregate demand.

According to the graph, when the government uses monetary and fiscal policies to improve full employment of production levels, there will be an increase in aggregate demand level of the economy from AD0 toAD1 which would result in the creation of full employment level of equilibrium out put represented at the point E. If the aggregate demand level increases further from AD1 to AD2 the general price levels shall increase since the full employment of production level will remain unchanged at Yf. The output level will not change since all resources are fully employed at the point of Yf.

An Aggregate demand level over and above the full employment of production level will create an inflationary gap of EF. In addition, an aggregate demand below the full employment of production level will create deflationary gap of ED.


The monetarists theory states that when the money supply is increased in order to grow or increase production and employment, creating an inflationary situation within an economy.

A monetarist believes increases in the money supply will only influence or increase production and employment levels in the short run and not in the long run. Accordingly, there will be a positive relationship between inflation levels and money supply. The monetarists explain this relationship using the theory of natural rate of unemployment.

The theory of natural rate of unemployment suggests that there will be a level of equilibrium output, employment, and corresponding level of unemployment naturally decided based on features such as resources employment, technology used and the number of firms in the country etc, the unemployment level decided in this manner will be identified as natural rate of unemployment.

In the short run, expansionary monetary policies will result in the decline in the natural rate of unemployment and increase the production but the effectiveness of the expansionary policies will be limited in the long run and lead to an Inflationary situation.


This theory states that the main reason for inflation is the in-elasticity in the structures of the economy. This theory is mainly used to explain the nature and basis of inflation in developing countries. Originating in Latin America, this theory states that the inflation rates in developing countries are affected by the in-elasticity of the following reasons;

  • Production level and capacity
  • Capital formulation
  • Institutional framework
  • High in-elasticity in the agricultural sector
  • In-elasticity of the labour force and employment structures.

Economic Consequences

Unfavorable effects

  • Increase in the cost of living

An increase in the general price of goods and services will increase the cost of living and lead to a decrease in the living standards of fixed income earners. Such a situation can create many social, economical, and political problems within a given country.

  • Inefficiency in resource utilization

In situations of inflation the aggregate demand for goods and services will decrease due t the decrease in purchasing power of consumers. Accordingly, output levels will be affected by a decrease, resulting in an overall reduction of full employment or resource utilization within the economy. On the other, hand the production of essential goods can be limited or ignored ignored since many producers will try to purchase high priced goods with a greater increase in price levels of inflationary effect and profit.

  • Savings are discouraged

Savings will be discouraged since the real value of savings declines and the returns that could be received through other means of investment increases. This is because the inflation is high than the rate of interest received on the deposits or savings.

  • Fixed income earners will be at a disadvantage

Fixed income earners or parties who receive wages, rent and interest income on previously agreed, fixed term contracts are the parties that are the most adversely affected by inflation. They are unable to increase their income and the real value of money continually decreases leading to a decrease in real income of these parties.

  • Long-term investments will be discouraged

There will be low levels of domestic and foreign investments due to the economic and political instability created by high levels of persistent inflation within the economy. On the other hand, speculators and investors tend to invest more on real assets than financial assets, which will lead to low levels of fund formation for business activities and long-term investments

  • Increased Government spending

The governments current and capital expenditure will increase in time inflation, since the government income remains unchanged or decreases, the budget deficit expands further. the government needs to provide assistance in terms of fund transfers to low and fixed income earners and if the government finances such expenditure using borrowings from banking sources, further inflationary pressure will be created.

  • Inflation creates adverse effects on the Balance of Payment and Foreign Exchange Reserves of a country.
  • High levels of domestic inflation can over value the foreign exchange rates of a country resulting in unfavourable situations in international trade.

Favourable effects

  • The producers, businesses, and organizations will benefit  from inflation, since the price levels of goods and services will increase at a higher level that the cost of production, thereby increasing profits.
  • Debtors shall benefit at the expense of creditors as the real value of loan installments and interest rates falls in situations of inflation.
  • An inflationary situation can stimulate or assist in the process of achieving economic growth since producers are encouraged with the increase in profits, resulting in the expansion of business activities.

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11 thoughts on “Theories of Inflation and its Economic Consequences”

  1. Dan says:

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  3. Aurora says:

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  8. Aurora says:


  9. Osamuyi Okpame says:

    Thank you so much for breaking down these advanced theories. I’m so grateful to you. was very easy and interesting with your help, for me to really analyse each of the theories to my own understanding.

  10. hellen says:

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  11. Aurora says:

    anytime guys 🙂

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