Back to: Personal Finance & Investing
Strip away the jargon and investing is simple: you buy assets that produce value over time. A stock is a tiny slice of ownership in a company; you profit if the company grows and shares in its risk if it doesn’t. A bond is a loan you make to a company or government that pays you interest; steadier, but with lower expected returns. Most portfolios are just mixtures of these two ingredients.
The central trade-off is risk versus return, filtered through time. Historically, broad stock markets have returned high single digits annually on average over long periods, but with gut-wrenching swings: individual years have ranged from roughly +30 percent to -38 percent. That volatility makes stocks dangerous for money you need in two years and powerful for money you won’t touch for twenty. Time horizon, not courage, is what determines how much stock risk is appropriate.
The second core principle is diversification: owning many assets so no single failure can sink you. One company can go to zero; the entire market of thousands of companies has historically recovered from every crash and gone on to new highs, though past performance never guarantees the future. How do ordinary people cheaply own the whole market? That’s the next lesson, and it’s the most useful one in this course.