What $100 Invested Since 1928 Actually Teaches Us

The long-term market chart is dramatic. It is also easy to misuse.

According to Aswath Damodaran’s NYU Stern historical-return dataset, updated January 5, 2026, a hypothetical $100 invested at the start of 1928 and compounded through the end of 2025 grew to approximately $1.16 million in the S&P 500 series with dividends reinvested. The same dataset shows roughly $7,800 for 10-year U.S. Treasury bonds and roughly $2,600 for three-month Treasury bills.

Those numbers are useful. They are not an instruction to put every dollar in stocks.

First, understand what the chart assumes

This is a historical index exercise, not an actual account statement from 1928. The series uses reconstructed market data and assumes the investment remained in place, income was reinvested and no money was added or withdrawn. It does not subtract advisory fees, fund expenses, transaction costs or an individual investor’s taxes.

The S&P 500 itself did not exist in its current form in 1928, and an ordinary investor could not have purchased today’s low-cost index fund at that time. The dataset is still valuable for studying asset-class history. We just need to call the illustration what it is.

I think precision makes the lesson stronger. It does not weaken it.

The ending value hides a difficult beginning

The $1.16 million ending value can make the journey look inevitable. It was not.

In Damodaran’s data, the hypothetical $100 stock investment was worth about $50.66 by the end of 1932. An investor who began in 1928 had experienced a decline of roughly half before the long compounding story had really started. The same series later includes wars, recessions, inflation, the 2000–2002 bear market, the 2008 financial crisis, the pandemic and other periods when staying invested did not feel easy.

Look, a client living through a loss does not experience it as one small dip on a 98-year chart. If the money is needed soon, the loss can force a sale. If the portfolio is larger than the client can emotionally tolerate, it can force a decision. Time only helps when the investor actually has time.

Cash has a job even when its long-term return is lower

Cash and Treasury bills did not compound like stocks over this period. That does not make them useless. Cash pays next month’s bills. A reserve can keep a client from selling long-term investments during a market decline. Short-term goals need stability more than a 98-year return.

The U.S. Bureau of Labor Statistics explains that inflation reduces the purchasing power of a dollar as prices rise. Its CPI Inflation Calculator can compare buying power across years. So holding long-term money entirely in currency creates one kind of risk, while exposing short-term money to stock losses creates another.

The question is not which asset wins every chart. The question is which risk the money can afford to take.

Taxes change the result the client keeps

The headline values are before individual taxes. In a taxable account, dividends, interest and realized gains may create current tax consequences. Traditional tax-deferred and Roth accounts follow different tax rules, so the same market return does not necessarily produce the same amount available to spend. IRS Publication 550 covers the federal treatment of investment income and gains and losses for taxable investment property.

This is where the CPA and investment perspectives should meet. A tax-efficient account cannot rescue a poor investment plan. But ignoring account type, cost basis and withdrawal timing can leave the client with less flexibility than the portfolio balance suggests.

And so compare after-tax choices when the tax difference is material. Do not choose an investment only because of a tax feature, and do not make a large taxable move without seeing the rest of the return.

A 98-year result cannot answer a three-year question

Consider a hypothetical 63-year-old who expects to retire in three years and will need $120,000 for the first year of retirement. The historical stock result does not tell that client to invest the entire $120,000 in stocks. It shows what happened to money that could remain invested for almost a century.

The client’s real work is to separate near-term spending from long-term growth, choose an allocation that can survive a difficult market and coordinate withdrawals with taxes. The SEC’s asset-allocation guidance makes the same central point: time horizon and risk tolerance should shape the mix.

Use the history for the right decision

The history supports a few durable conclusions. Compounding can become powerful over long periods. Inflation makes idle long-term money less safe than it looks. Stocks have delivered strong historical growth, but the path included serious losses. Bonds and cash can support stability, liquidity and spending even when their long-run ending values are lower.

Past performance does not tell us what the next 98 years will produce. It gives us context for building a plan that does not require a prediction.

Do not use a 98-year chart to answer a three-year question. Match each dollar to its actual timeline, then let the long-term dollars stay long term.