Purchasing Power Parity

Purchasing Power Parity (PPP) is an economic theory that estimates the currency exchange rates necessary in foreign trade situations so that each currency has the same purchasing power.
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Definition

Purchasing Power Parity (PPP) is an economic theory and method used to determine and compare the relative value of different currencies. The concept is based on the idea that in the absence of transaction costs and other barriers, identical goods and services should have the same price when expressed in a common currency. This implies that the exchange rates should adjust so that the same basket of goods or services has the same price in two different countries when converted at current exchange rates.

Examples

  1. Big Mac Index: A practical example of PPP is the Big Mac Index created by The Economist. If a Big Mac costs $5 in the US and £3 in the UK, then according to PPP, the exchange rate should be 5/3 = 1.67 USD/GBP.

  2. International Comparison: If the price of a certain commodity in Germany is €100, and in the US it’s $120, then according to PPP, the exchange rate should be 1.2 USD/EUR to equate the two prices.

Frequently Asked Questions

What is the basic premise of PPP?

The basic premise of Purchasing Power Parity is that identical goods should have the same price in different markets when the prices are expressed in a common currency.

How is PPP calculated?

PPP is usually calculated by dividing the cost of a basket of goods in one country by the cost of the same basket in another country.

What are the types of PPP?

There are two main types of PPP: Absolute PPP and Relative PPP. Absolute PPP compares the price levels between two countries directly, while Relative PPP accounts for the changes in price levels over time.

What factors can affect PPP?

Factors that can affect PPP include trade barriers, transportation costs, taxes, and differences in product quality.

Is PPP always accurate?

PPP is not always accurate due to the presence of market imperfections, transaction costs, and differences in consumption patterns across countries.

  • Exchange Rate: The value at which one currency can be exchanged for another.
  • Inflation: The rate at which the general level of prices for goods and services is rising.
  • Relative PPP: A theory that suggests that exchange rates will change to compensate for differences in inflation rates between two countries.
  • Basket of Goods: A fixed set of consumer products and services valued on an annual basis, often used to measure inflation.
  • Big Mac Index: An informal way of measuring the Purchasing Power Parity between two currencies by comparing the price of a Big Mac in each country.

Online References

Suggested Books for Further Studies

  • “Purchasing Power Parities and Real Expenditures: Theories and Methods” by Robert Summers and Alan Heston
  • “International Economics” by Paul Krugman and Maurice Obstfeld
  • “The Big Mac Index: Applications of PPP” by Richard Baldwin and Charles Wyplosz
  • “Exchange Rates and International Finance” by Laurence Copeland

Fundamentals of Purchasing Power Parity: Economics Basics Quiz

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