Investing basics
Investing is surrounded by more noise than any other part of money. These pages strip it back to what the words mean and what actually drives the result.
What is investing, actually?
Investing is buying a share of something productive — companies, property, loans — in the hope it earns money over time. Unlike saving, the value moves, and it can move down. You are being paid, on average and over long periods, for accepting that uncertainty rather than for being clever.
What is the difference between saving and investing?
Saving keeps money's value stable and available; investing accepts that the value moves in exchange for a chance of growth. The dividing line is time. Money you need within about five years belongs in savings. Money you will not touch for decades slowly loses purchasing power sitting in cash.
What is compound growth, and why does everyone go on about it?
Growth earning growth. Money that grows produces a larger base, which grows again, so the increases accelerate. Contributing 200 a month for thirty years, assuming seven percent, you would put in 72,000 and end with roughly 244,000 — meaning about seventy percent of the result came from growth rather than from you.
Do investment fees really matter that much?
Enormously, because they compound against you exactly as returns compound for you. On 100,000 over thirty years at seven percent, paying one percent a year instead of 0.2 percent costs about 145,000 — roughly a fifth of the final amount. A two percent fee costs closer to forty percent of it.
What return should I expect from investing?
Nobody can tell you, and anyone stating a precise figure is guessing. Diversified shares have historically returned meaningfully more than inflation over long periods, but with enormous variation between decades. Plan pessimistically — if a plan only works at optimistic returns, it is not a plan, it is a hope.
What is an index fund?
A fund that simply holds everything in a defined market, in proportion, rather than choosing what to buy. Because nobody is picking, it costs very little to run — and cost is one of the few things about investing you can both control and know in advance.
Why does diversification matter?
Because any single company can fail completely, and nobody can reliably tell in advance which one will. Spreading across many holdings removes the risk specific to any one of them while keeping the general growth of the market. It is the closest thing to a free improvement in investing.
Is investing just gambling?
No, though it can be done in a way that closely resembles it. Gambling is a zero-sum bet on an event; investing is owning a share of businesses that produce things and pay people. The distinction collapses if you buy single companies on tips, hold briefly, and treat price movement as the point.
How much money do I need to start investing?
Far less than most people assume — in many places the practical minimum is a small monthly amount rather than a lump sum. The more useful question is not how much you need but what should come first: expensive debt cleared, and a buffer that stops you selling investments to fix a car.
Should I try to time the market?
Almost certainly not. Getting it right requires two correct decisions — when to leave and when to return — and most people who sell during a fall come back after the recovery. Time in the market is the part you can control; timing it is the part almost nobody does reliably.
What should I do when the market falls?
Usually nothing, which is harder than it sounds. Falls are a normal feature of what you bought, not a sign it broke. Selling converts a temporary decline into a permanent loss, and then requires you to decide when to return — a decision almost nobody gets right.