Left alone, compounding does something that's easy to say and hard to feel: growth earns growth. A gain doesn't just sit there — it becomes part of the base the next gain is measured against — and through reinvestment, dividends do the same job, buying more shares that go on to pay their own dividends.
None of this is a promise about what any investment will actually return — markets can fall as well as rise, and past growth doesn't guarantee future growth. What it does show, mechanically, is why time horizon matters more than most people expect: the same rate of growth needs far less of it to reach a doubling over thirty years than over three.
Illustrative only — no rate of return is guaranteed.
Educational content only. It is not personal financial advice.