In a 1999 Fortune essay, Warren Buffett explained that interest rates act on asset prices the way gravity acts on matter: the higher the rate, the stronger the downward pull. It's one of the most useful metaphors in investing, and this chapter unpacks why it's literally true, not just poetic.
Every investment is a claim on future cash — a bond's interest payments, a stock's future profits, a building's rents. To decide what future cash is worth today, investors compare it to what they could earn safely in the meantime, and the interest rate on safe government bonds is that alternative. When safe bonds pay more, future cash from everything else is worth less today. When safe bonds pay almost nothing, even distant, uncertain profits start to look attractive.
That's the gravity. It pulls on every asset at once — stocks, bonds, real estate, gold — which is why big moves in rates ripple through markets that seem unrelated.
The tool behind the metaphor is present value — what a future dollar is worth today. The logic: if safe bonds pay 5%, then $100 today grows to $105 in a year. Flip it around, and $105 arriving a year from now is worth only $100 today. Money on the way is always worth less than money in hand, and the interest rate sets exactly how much less.
The rate you use for this flip is called the discount rate. For risky investments it's the safe bond rate plus something extra to compensate for uncertainty. The higher the discount rate, the harder future cash gets squeezed.
And the squeeze compounds with time. At a 5% discount rate, $100 arriving next year is worth about $95 today. The same $100 arriving in ten years is worth about $61. In twenty years, about $38. Distance in time works like distance in a telescope — far-away things look smaller, and higher rates shrink them faster.
Here's why rising rates hit growth stocks hardest. Imagine a young company expected to earn very little for years, then $10 per share a decade from now. Most of its value lives in that distant future.
When rates are low — say investors discount at 2% — that year-ten $10 is worth about $8.20 today. Now rates rise, and investors discount at 6% instead. The same $10 is worth about $5.58 today. Nothing about the company changed. No sales were lost, no product failed. Yet the present value of its future fell roughly 32%, purely from the rate change.
A mature company earning $10 per share right now barely feels this math, because its cash isn't far away being shrunk. That gap is exactly what markets lived through in 2022: as central banks raised rates at the fastest pace since the early 1980s, the tech-heavy Nasdaq index fell about 33% for the year, while many steady dividend payers fell far less.
Bond investors have a word for this sensitivity: duration. Formally it measures how long, on average, you wait for an investment's cash. Practically, it's a rate-sensitivity dial: as a rule of thumb, a bond with a duration of 10 loses roughly 10% of its price when rates rise one percentage point, while a bond with a duration of 2 loses roughly 2%.
That's why a 30-year government bond — issued by the safest borrower there is — can still lose a third of its value, as long-term US Treasuries did during 2022's rate surge. Safe from default is not safe from rates.
The concept stretches beyond bonds. A profitless growth stock, with its cash flows far in the future, behaves like a long-duration asset. A utility bought for next quarter's dividend behaves shorter. You can't calculate a stock's duration precisely, but the intuition holds: the further away an investment's money is, the harder rate gravity pulls on it.
Short-term rates are set by central banks — the Federal Reserve in the US, the Bank of Canada — as their main tool for steering inflation and employment. The Fed's policy rate is called the federal funds rate. When inflation runs hot, central banks raise it to cool borrowing and spending. When the economy stalls, they cut.
Long-term rates are different: markets set them. The 10-year Treasury yield reflects what bond buyers collectively expect about future inflation, growth, and central bank moves. That's why long rates sometimes fall while the central bank is hiking, or rise while it's cutting — the market is looking past today's policy to what it thinks comes next.
For asset prices, the 10-year yield usually matters most, because it's the discount rate most valuations lean on. Between 2020 and 2023 it went from about 0.5% to about 5% — the gravity dial spun from nearly off to its strongest setting in more than fifteen years.
Knowing the mechanism is not the same as being able to trade it. In the 2010s, plenty of smart investors avoided stocks because rates supposedly had to rise soon. Rates stayed low for a decade, and the avoiders missed one of the great bull markets. Others assumed the 2022 hikes guaranteed a quick recession that, years later, still hadn't arrived on schedule.
Rates also never act alone. Higher rates squeeze valuations, but if they're rising because the economy is booming, growing profits can outweigh the squeeze. Falling rates flatter valuations, but if they're falling because a recession is hitting, collapsing profits can swamp the benefit. The gravity is real; it's just one force among several.
The durable lessons are humbler. Understand how much of your portfolio lives in the distant future. Expect long-duration assets — growth stocks, long bonds — to swing hardest when rates move. And be suspicious of anyone who claims to know where rates go next. The bond market itself gets that wrong constantly.
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