Indexy a trhy
What Drives Stock Markets: Earnings, Rates, and Expectations
Key takeaways
- Stock markets react to three key forces: corporate earnings, interest rates, and expectations about the future.
- Rising corporate earnings increase company value; falling interest rates increase the present value of future earnings.
- The market is forward-looking — it reacts to expectations, not to the past.
- Macroeconomic data (inflation, GDP, employment) moves markets because it affects rates and earnings.
- Short-term movements are unpredictable; long-term, earnings growth dominates.
Stock markets are driven by three fundamental forces: corporate earnings, interest rate levels, and the collective expectations of market participants.
Corporate earnings — the foundation of value
A share is a claim on a company's future earnings. The more a company earns (or the more it is expected to earn), the higher the share price. That is why quarterly results — earnings — are so pivotal for the market. A company that earns more than the market expected typically rises after the announcement. Disappointment brings a decline.
Interest rates — the price of money over time
Interest rates affect equities in two ways. First: rates are an alternative — if government bonds offer 5%, equities must offer greater potential to attract investors. Second: rates affect the discounting of future earnings. Higher rates = future earnings have a lower present value. That is why technology stocks (with a large portion of earnings far in the future) are especially sensitive to rates.
Expectations — the market looks forward
The market does not react to what has happened, but to what is expected. That is why an economy can grow and stocks still fall — if the market expected bigger growth. This explains the apparent paradox: good news sometimes takes the market lower, because "overpriced" expectations normalize.
Why short-term moves cannot be predicted
The combination of all three factors and endless feedback loops makes short-term prediction of market moves a gamble. Long-term, however, earnings growth dominates — that is why stock markets are significantly higher over decades. How to view market movements from the perspective of cycles is explained in the article on the business cycle and sectors. What long-term returns to expect is discussed in the article on historical returns.
FAQ
Why do stocks react to interest rates?
Because rates affect the value of future earnings. Higher rates reduce the present value of distant earnings, so technology and growth stocks fall more. Rates are also an alternative — bonds with higher yields compete with equities.
What is the P/E ratio and why does it matter?
The ratio of a stock's price to its annual earnings per share. It shows how much you pay for a unit of earnings. A high P/E = the market expects strong future growth. A low P/E = cheaper valuation or pessimism about growth.
Why does the market sometimes fall on good news?
Because the market reacts to surprises, not to absolute results. If a company earned well but the market expected better, the result is a "disappointment" and the stock falls. Good news is already priced in advance.