purchasing power parity for 9 December 2025

Purchasing Power Parity (PPP) is an economic concept that compares currencies based on how many goods and services they can buy in different countries. It adjusts for cost-of-living differences, making international comparisons more accurate than market exchange rates. PPP shows the real value of money by measuring the price of a common basket of goods. 

It is widely used to compare GDP, living standards, and poverty levels across countries. India ranks as the third-largest economy in the world by Purchasing Power Parity (PPP), after China and the United States.

Types of Purchasing Power Parity

1. Absolute Purchasing Power Parity

Absolute PPP says that identical goods in two countries should cost the same when prices are converted using the exchange rate. It is based on the “law of one price” and compares the actual price levels directly.

Formula:

PPP Exchange Rate = Price in Country A / Price in Country B.

2. Relative Purchasing Power Parity

Relative PPP compares inflation rates between two countries and predicts how exchange rates adjust over time. It does not compare exact prices but focuses on changes in price levels.

Formula:

New Rate = Old Rate × (1 + Inflation in A) / (1 + Inflation in B).

3. National/ Aggregate PPP (Used for GDP Comparison)

This type of PPP compares the cost of a large basket of goods and services across countries to measure real GDP and living standards. It is used by international agencies for global GDP and poverty comparisons.

4. Implied PPP (Informal Method)

Implied PPP uses the price of a single standardized item like a burger, coffee, or commodity, to estimate currency undervaluation or overvaluation. It is not official, but it helps understand currency differences.

India’s GDP Ranking in PPP Terms

India is the 3rd largest economy in the world in PPP terms, ranking just after China and the United States. Many forecasts say India could become the 2nd largest economy by around 2038 if its growth continues at the same pace. PPP adjusts for cost of living, so it gives a clearer and more realistic picture of India’s actual economic strength than nominal GDP.

PPP in International Comparisons

Purchasing Power Parity (PPP) helps compare countries by adjusting for differences in prices and living costs, giving a clearer picture of real economic strength. It is used by the World Bank, IMF, and UN to compare GDP, poverty, and living standards fairly across nations.

PPP in International Comparisons
Rank	Country	GDP (PPP) in trillion USD (approx.)
1	China	$33.7 trillion
2	United States	$27.9 trillion
3	India	$14.7 trillion
4	Japan	$6.5 trillion
5	Germany	$5.8 trillion

Factors Affecting Purchasing Power Parity

• Differences in inflation between countries change the purchasing power of currencies and cause PPP to deviate.
• Interest rate changes attract or reduce foreign capital, which affects currency demand and breaks PPP.
• Trade barriers like tariffs and quotas increase prices of imported goods and prevent equal pricing.
• Transportation and shipping costs make the same goods costlier in some countries, affecting PPP.
• Differences in product quality, brands, and consumer preferences create price gaps across nations.
• Market imperfections such as subsidies, taxes, and monopoly control distort domestic prices.
• Non-tradable goods and services like housing or local labour cannot be compared internationally, causing price differences.
• Currency speculation and sudden capital flows change exchange rates quickly, moving away from PPP.

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