Module 7 · Living with uncertainty · Lesson 2 of 5

Risk, uncertainty and ambiguity

Some unknowns can be estimated. Some can’t. They call for different responses.

8 min read · Free — no account needed to read

The idea

Economists distinguish two kinds of unknown. Risk is when you can estimate the odds: roughly how likely a flight delay is, what share of small businesses survive five years, the chance of rain tomorrow. Uncertainty is when you cannot: whether a brand-new idea will work, how you will feel in a new country, what your field will look like in ten years.

Risk can be managed with numbers and precautions: insurance, savings, backup plans. Uncertainty cannot be calculated away; it calls for flexibility, small bets and the ability to change course. Treating true uncertainty as if it were calculable risk gives false confidence.

Ambiguity is a close cousin: situations that can be read more than one way, where even the question is unclear. Accepting ambiguity means being able to live for a while without a clear answer, instead of grabbing the first interpretation that ends the discomfort.

Why it matters

Knowing which kind of unknown you face helps you respond sensibly: use numbers where they exist, and flexibility where they do not. People who can tolerate ambiguity make fewer hasty decisions made only to escape it.

See it happen

Pedro is deciding whether to open a café. He has built a detailed spreadsheet showing it will be profitable within a year.

The first read

The numbers look good and he has thought it through carefully, so he feels confident the plan will work.

With this idea

He sees that rent and equipment costs are risks he can estimate, but whether locals will like his café is genuine uncertainty. He runs weekend pop-ups in the area for two months before signing a lease, to learn what his spreadsheet could not tell him.

What changed

He separated what could be calculated from what could only be learned by trying.

Easy to get wrong

• Trusting a precise-looking number for something that cannot really be estimated.
• Assuming uncertainty means anything could happen equally. You still know more about some outcomes than others.

What this rests on

Well studied. Researchers have studied this a good deal. The core idea holds up, though details vary between people and settings.

• Frank Knight — Risk, Uncertainty and Profit (1921) — The classic distinction between risk, where the odds can be estimated, and uncertainty, where they cannot.

Try it: Risk or uncertainty?

1. Write a decision you are facing.
2. List the unknowns involved.
3. Mark each R (the odds can be estimated) or U (they cannot).
4. For each R, write a precaution. For each U, write a small way to learn more.

Reflect

• Where are you treating a real uncertainty as if you could calculate it?
• How comfortable are you with not knowing — and what do you do to escape it?

Use it in the coming days

For one plan this week, write which of its unknowns are risks and which are uncertainties, and add one small learning step for an uncertainty.

Where to do it: My Journal

Writing out the unknowns helps you tolerate them without rushing to a false answer.