Expected Value

Shrink Definition

Expected value is the average outcome anticipated from a decision when each possible outcome is weighted by its probability. Expected value encourages evaluating decisions based on likely long-term outcomes rather than isolated successes or failures.

Plain language

Good decisions consider both likelihood and payoff.

Shrink Insight

A rare great outcome doesn't necessarily make a strategy wise.

Why it matters

Expected value improves: • investing • medicine • entrepreneurship • insurance • leadership • negotiation • strategic planning

Common misunderstanding

A good decision can still produce a bad outcome. A poor decision can occasionally produce a good outcome. Expected value evaluates the decision process, not a single result.

Shrink Perspective

Judge decisions by the quality of reasoning, not isolated luck.

Shrink Reflection

Have you ever abandoned a good strategy because of one disappointing outcome?

Shrink Journal

Identify one recurring decision. List the likely outcomes and estimate their probabilities.

Shrink Step

Think in averages rather than anecdotes.

Shrink Minute

Probability deserves attention.

Shrink Takeaway

Better decisions compound over time.

Medical boundary

Evidence summary

Expected value is a central principle of probability theory, economics, medicine, finance, and decision science. It supports evaluating choices under uncertainty by integrating outcomes with their likelihood.