Information is useful only when it can change a choice
Knowing more feels like an advantage, but information has economic value only if it can improve a decision enough to justify the cost of getting it. The cost may be money, but it can also be time, effort, or attention diverted from something more important.
Imagine deciding whether to take a short walk. Checking a forecast might reveal a chance of rain, but if you would go anyway—and getting wet would be only a minor inconvenience—the forecast may not change your choice. Its practical value is small, even if the information is accurate.
The hidden calculation
A person does not need to calculate exact probabilities to make this judgment. The useful questions are: How bad could the wrong choice be? How likely is new information to alter what I do? And what would finding it out cost?
Information is especially valuable when it could prevent a large loss or redirect a consequential decision. Before signing a major contract, for instance, checking a key condition may be worth considerable effort because the consequences of missing it could be serious. For a trivial choice, the same level of investigation would be wasteful.
This is why being uninformed can be rational without being careless. The goal is not to know everything; it is to gather enough information for the decision at hand. When the stakes are low and further searching is unlikely to change the outcome, moving on preserves time and attention for choices where they matter more.
