Logic and Decision-Making Under Uncertainty

You Will Never Have All the Information

Most important decisions — voting, career choices, policy preferences, health decisions — must be made under uncertainty. You do not know which candidate will actually deliver on promises. You do not know which career path will bring satisfaction. You do not know whether a medical treatment will work for you specifically.

The logical response to uncertainty is not paralysis — it is structured thinking about risk. A decision matrix lists your options, the possible outcomes for each, and the probability and value of each outcome. Even a rough matrix forces you to think systematically about what you value and what you know.

Opportunity Cost and Sunk Cost

Opportunity cost is what you give up by choosing one option over another. Spending $2 trillion on a military intervention means not spending that money on infrastructure, healthcare, or debt reduction. Every choice has an opportunity cost, and rational decision-making requires considering it.

Sunk cost fallacy is the tendency to continue investing in something because you have already invested heavily, even when the investment is not paying off. 'We have already spent $500 billion on this war, so we cannot pull out now.' The $500 billion is gone regardless — the only question is whether continuing is better than stopping from this point forward. Past investment is irrelevant to future decisions.

Politicians exploit the sunk cost fallacy constantly: 'We cannot abandon this program after investing so much.' The logical question is always: given what we know now, is continuing better than the alternatives? What has been spent is irrelevant.