Inflation: Why Saving Without Investing Isn't Enough
Introduction
Some people are remarkably disciplined with money. They spend little, save every month, and build up substantial balances. Yet they leave that money sitting in a checking account or a savings account that pays almost nothing, because investing scares them. They feel safe that way. And in one sense, they are: the number on the screen never goes down.
The problem is that the number on the screen isn't what matters. What matters is what that money can buy—and that does go down, every single year, even if you can't see it. Inflation is a silent tax levied on idle cash, and anyone who ignores it can discover, after years of hard work, that their savings buy far less than they thought.
Keeping money uninvested doesn't eliminate risk. It swaps it for an invisible one: the certainty of losing purchasing power.
What Inflation Is
Inflation is the broad rise in prices over time. When prices go up, each unit of currency buys less. If inflation is 4% in a given year, what used to cost $100 now costs $104, and $100 sitting in your account buys slightly less than it did the year before.
Most central banks around the world aim to keep inflation low and stable, often targeting around 2% or 3% per year. Yet even those moderate figures, compounded over years, have a massive impact.
The Compounding Effect
The Rule of 72 works for inflation too: dividing 72 by the annual inflation rate gives you roughly the number of years it takes for money to lose half of its purchasing power.
- At 3% annual inflation: about 24 years.
- At 4%: about 18 years.
- At 6%: about 12 years.
For example, $10,000 sitting in an account earning zero interest for 18 years during 4% average inflation keeps the exact same $10,000 balance on the screen, but buys what roughly $4,900 would buy today. Half of the saving effort vanished without anyone noticing.
And during periods of high inflation, like the one many countries experienced between 2021 and 2023, the erosion happens much faster.
Nominal vs. Real Returns
To know whether your money is truly growing, you have to distinguish between two concepts:
- Nominal return: the percentage an investment pays before adjusting for inflation.
- Real return: the nominal return minus inflation.
A certificate of deposit paying 5% when inflation is 4% only yields about 1% in real terms. Once you factor in fees or taxes, the real return can easily turn negative. What matters for your future is always the real return.
What Has Historically Protected Against Inflation
Elroy Dimson, Paul Marsh, and Mike Staunton of the London Business School have spent decades reconstructing asset returns since 1900 across dozens of countries. Broadly speaking, their data shows:
- Stocks: over the long run, equities have delivered the highest real return—around 5% per year for a global portfolio—though with sharp downturns and multi-year slumps along the way. Companies can raise prices along with inflation, which helps protect their earnings over time.
- Bonds: much lower real returns, and during bouts of high inflation they can lose real value for years.
- Short-term bills and savings deposits: real returns close to zero on average, and sometimes negative.
Other assets play a role too. Real estate tends to keep pace with inflation over the long term, primarily through rising rents. Gold has preserved purchasing power over very long horizons, but with huge swings and decades of poor returns—what Claude Erb and Campbell Harvey called "the golden dilemma." And many governments issue inflation-indexed bonds (such as TIPS in the U.S.), which guarantee a real return above inflation and are a useful tool for the conservative portion of your savings.
Saving Defends, Investing Builds
Saving is a necessary condition for building wealth, but it isn't enough on its own. Saving protects your present: against emergencies, debt, and living paycheck to paycheck. Investing protects your future: against inflation and against having to rely on your own labor until the very last day.
That is why it makes sense to separate your money by job:
- Emergency fund and near-term expenses: keep in liquid, safe accounts, accepting that the real return will be low. Its job is to be available, not to grow.
- Medium-term savings: keep in fixed-income instruments, CDs, or inflation-protected bonds that at least aim to keep pace with inflation.
- Long-term savings: invest in productive, diversified assets such as low-cost stock index funds, accepting short-term volatility in exchange for long-term real growth.
Overcoming the Fear of Investing
For someone who has never invested before, market ups and downs can be intimidating. A few ways to start prudently:
- Start small. Small amounts let you get used to seeing balances fluctuate without affecting your daily life.
- Contribute a fixed amount every month, without trying to guess the best time to buy.
- Diversify broadly using low-cost index funds rather than betting on individual stocks.
- Only invest money you won't need for years.
Common Mistakes
Looking only at the nominal balance. The number on the screen can go up while your purchasing power goes down.
Keeping years' worth of expenses in a checking account earning nothing, far beyond what an emergency fund requires.
Investing your emergency fund in stocks to beat inflation. Every dollar has a specific job.
Chasing promises of high, guaranteed returns. They don't exist, and they are almost always scams.
Waiting until you understand everything before starting. Paralysis has a cost too.
Conclusion
Inflation never shows up as a line item on your bank statement, yet it chips away at idle cash every single year. Saving is essential; leaving everything uninvested for decades is accepting an almost guaranteed loss. Check today how much money you have sitting in accounts that pay zero interest or less than inflation. Leave your emergency fund and upcoming expenses there, and for the rest, take one concrete first step: find out what low-cost, diversified investment options are available to you.
References
- Dimson, E., Marsh, P., & Staunton, M. (2002). Triumph of the Optimists: 101 Years of Global Investment Returns. Princeton University Press.
- Erb, C. B., & Harvey, C. R. (2013). The golden dilemma. Financial Analysts Journal, 69(4), 10-42.
- Siegel, J. J. (2014). Stocks for the Long Run (5th ed.). McGraw-Hill.
- Clason, G. S. (1926). The Richest Man in Babylon. Penguin (modern ed.).