Purchasing Power
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The quantity of goods and services that can be bought with a unit of currency, reflecting the real value of money after accounting for price levels and inflation.
## Purchasing Power
Purchasing power measures how much a given amount of money can buy. It varies over time (inflation erodes purchasing power) and across geographies (prices differ between cities and countries).
### Why It Matters for Salaries
A $100,000 salary in San Francisco buys far less than the same salary in Austin due to differences in housing, food, and transportation costs. Salary comparison tools adjust for purchasing power to provide meaningful cross-city comparisons.
### Key Metrics
- **Consumer Price Index (CPI)**: Tracks purchasing power changes over time.
- **Purchasing Power Parity (PPP)**: Adjusts for price level differences between countries.
- **Real Wage**: Nominal wage adjusted for inflation.
- **Big Mac Index**: The Economist's informal PPP measure.
### Inflation's Impact
If inflation is 5% and a salary increases by 3%, the employee's purchasing power has decreased by approximately 2% in real terms, even though their nominal pay rose.