The Mathematics of Inflation
The formula for calculating the value of money across time using CPI is:
Why Inflation Happens
Economists point to three primary drivers:
- Demand-Pull: When demand for goods exceeds the economy's ability to produce them, prices rise ("Too much money chasing too few goods").
- Cost-Push: When the cost of production (wages, raw materials) rises, businesses pass those costs to consumers.
- Monetary Expansion: When the central bank prints more money, the value of each existing dollar decreases.
Inflation vs. Deflation
While inflation erodes savings, Deflation (falling prices) can be even more dangerous for an economy. It encourages consumers to delay spending, which leads to lower production, job losses, and a "Deflationary Spiral" like the Great Depression.
Era Benchmarks ($100 in 1913):
- • In 1940: ~$141
- • In 1970: ~$392
- • In 2000: ~$1,739
- • Today: ~$3,170+
The Best Inflation Hedge
Historically, the best way to beat inflation is to own Productive Assets like stocks or real estate. While the dollar loses 3% of its value every year, companies raise prices and real estate rents increase, effectively "indexing" your wealth to the rising cost of living.
How to Use This Tool
Select Historical Mode to see how prices have changed between any two years in American history. Or use Projected Mode to see how a specific annual inflation rate (like the Fed's 2% target) will impact your retirement nest egg over the next 30 years.