Common mistake

Expecting each decade to add about the same

It sounds like this

“If it grew £1,000 in the first ten years, it'll grow about £1,000 in each ten years after that.”

Why it’s wrong

Each decade starts from a bigger amount, so at a steady rate each one adds more than the last.

The lesson that fixes it

→Most of it comes at the endBecause the amount keeps doubling, each doubling adds as much as all the ones before it put together, so compound growth looks slow for years and then takes off — and a straight line drawn from the early years falls far short of where it ends.read free

Cognosc spots mistakes like this.

When you explain something in your own words, Cognosc can tell exactly which mistake you’re making — not just that you’re wrong — and gives you a short lesson to fix that one thing.

Start a course More common mistakes