Explore Purchasing Power Parity (PPP), real interest rate adjustments, and how sustained domestic inflation erodes international exchange values.
The Direct Connection Between Inflation and Exchange Rates
Inflation measures the broad increase in price levels for goods and services over time within an economy, reflecting a decline in domestic purchasing power. In international financial markets, a country experiencing consistently high inflation sees its currency depreciate relative to currencies of nations with stable price environments.
This relationship is explained by the economic theory of Purchasing Power Parity (PPP), which posits that exchange rates between currencies are in equilibrium when their purchasing power is identical in each of the two countries.
Purchasing Power Parity (PPP) Explained
If a basket of consumer goods costs $100 in the United States and £80 in the United Kingdom, the implied PPP exchange rate is 1.25 USD per GBP. If UK inflation causes that same basket to rise to £100 while US prices remain constant, the British Pound must depreciate relative to the US Dollar to preserve international trade competitiveness.
Frequently Asked Questions
Why do central banks target a 2% inflation rate?
A moderate 2% annual inflation rate encourages investment and consumer expenditure while avoiding the risks of deflationary spirals or hyperinflationary currency collapse.