The Assumption Auction

Missing context

Busyness describes inputs: hours, meetings, messages, motion. Productivity is about outputs, and whether they were worth the inputs. The two can travel together, but they are measured in different units.

A counterexample

A day of back-to-back calls and instant replies can end with nothing finished, while two quiet, uninterrupted hours produce the one thing that actually mattered.

A better reading

Busyness is easy to see, so it often stands in for results that are harder to see. Treat it as a clue about effort, not a verdict about output.

House reading: It depends

Missing context

A “yes” can mean “I agree”, but it can also mean “I heard you”, “not in front of everyone”, or “I can’t really say no to you”. Which one depends on power, setting, custom and what refusing would cost.

A counterexample

A new team member says “Yes, sure” to a deadline in a group meeting while already doubting it can be met, because objecting in public feels riskier than slipping quietly later. (An illustrative scenario, not a reported case.)

A better reading

Agreement is easier to confirm in specifics than in tone: what will happen, by when, under which constraints, and what would make it slip.

House reading: It depends

Missing context

Doing a task brilliantly and helping other people do it well draw on overlapping but different skills. Grades and individual results mostly measure the first.

A counterexample

A top individual performer who prefers to fix everything personally may struggle once the job becomes coaching, delegating and making other people’s work easier.

A better reading

In a large study of sales workers across 214 firms, companies tended to promote their strongest sellers, yet higher pre-promotion sales were associated with weaker results among the people those new managers led; experience of working collaboratively was a better signal. It is one study in one field, about workers rather than students, so read it as a strong caution rather than a law.

House reading: Mostly doesn’t hold

Check it: NBER: Promotions and the Peter Principle in the references drawer.

Missing context

Popularity tells you how many people chose something. Their reasons can include quality, but also price, availability, advertising, habit, imitation and the path of least effort.

A counterexample

When an option is set as the default, many people simply stay with it. Decision-making research describes how switching retirement saving from opt-in to automatic enrolment (with an opt-out) substantially raised participation without changing the options themselves.

A better reading

Popularity is evidence that something is acceptable to many people under current conditions. Whether it is best for you depends on what you need and on how the choice was set up.

House reading: It depends

Check it: Noba: Judgment and Decision Making in the references drawer.

Missing context

When two things move together, the link could run in either direction, or a third factor could drive both. A correlation shows a pattern, not its cause.

A counterexample

If generous people report more happiness, generosity might lift mood, happier people might give more, or something like income might make both easier.

A better reading

Introductory research-methods material is clear that a correlation alone usually can’t tell you what causes what. Experiments that randomly assign people to conditions are the standard way to test a causal claim, though they aren’t always possible or ethical.

House reading: Mostly doesn’t hold

Check it: Noba: Research Designs in the references drawer.

Missing context

Confidence is a feeling about a judgment; accuracy is how well the judgment matches the world. They are related, but people are often more confident than their track record justifies.

A counterexample

In a classic classroom exercise, people give ranges they feel 98% sure will contain the true answers to general-knowledge questions. Most capture far fewer answers than that level of confidence implies.

A better reading

Confidence becomes more trustworthy once it has been checked against outcomes. Without that feedback, treat strong certainty as a reason to look for evidence, not a substitute for it.

House reading: It depends

Check it: Noba: Judgment and Decision Making in the references drawer.

Missing context

Whether a positive result is probably right depends on three things together: how often the test catches true cases, how often it raises false alarms, and how common the condition was in the first place. That last one is the base rate.

A counterexample

If a condition is rare, even a fairly accurate test can produce more false alarms than true finds, simply because there are so many more people without the condition to be wrongly flagged. Try the base-rate model further down this page.

A better reading

Bayes’ theorem formalises how a prior probability (the base rate) combines with the strength of the evidence. Accuracy figures alone cannot answer the question; you also need to know how common the thing was before anyone tested.

House reading: It depends

Check it: SEP: Bayes’ Theorem in the references drawer.

Missing context

“No reply yet” is an observation. “They’re annoyed” is one interpretation among many: busy, travelling, unwell, thinking it over, didn’t see it, assumed no reply was needed.

A counterexample

A message sits unread because it arrived in the middle of someone’s chaotic week and slid below newer notifications. Nothing about you entered the picture. (Illustrative.)

A better reading

Silence carries very little information on its own. If it matters, the cheapest evidence is usually a short, low-pressure follow-up.

House reading: Mostly doesn’t hold

Missing context

Broad agreement among people who study a question carefully is strong evidence, often the best available. Its weight depends on whether they are experts in this question, how the agreement was established, and how settled the underlying evidence is.

A counterexample

A respected specialist offering a confident opinion well outside their field, or two quoted voices presented as “the experts”, carries far less weight than a field’s considered consensus.

A better reading

Consensus deserves heavy weight, not infinite weight. Settled for practical purposes is not the same as closed to new evidence. The useful skill is telling a real consensus from a borrowed one.

House reading: It depends

Missing context

An opening number tells you what someone is asking, which reflects their costs, hopes and tactics. On its own it says little about value.

A counterexample

Classroom demonstrations show estimates drifting towards whatever number is mentioned first, even an obviously arbitrary one, with people adjusting away from it too little. The pattern is called anchoring.

A better reading

Treat the first figure as information about the person who said it, not about the item. Form your own estimate from comparisons before you let anyone else’s number into the room.

House reading: Mostly doesn’t hold

Check it: Noba: Judgment and Decision Making in the references drawer.

Missing context

One success shows that something can work under some conditions. It doesn’t show which conditions were essential, or how often it fails for others.

A counterexample

Picture a study routine that works for someone with a quiet room, flexible hours and nobody depending on them. The same routine may collapse for someone sharing a room and working evenings. (Illustrative.)

A better reading

Personal experience is real evidence about you. Before generalising it, look for the people it didn’t work for, and for what was different about them.

House reading: It depends

Missing context

The same outcome can be described as a gain (“200 of 600 are saved”) or as a loss (“400 of 600 are lost”). Logically nothing changes. Psychologically, quite a lot does.

A counterexample

In a well-known decision problem, most people pick the sure option when outcomes are framed as lives saved, and the gamble when exactly the same outcomes are framed as lives lost.

A better reading

Framing effects are a well-documented pattern in judgment research. A practical habit: restate any important choice the other way round and see whether your preference survives.

House reading: Mostly doesn’t hold

Check it: Noba: Judgment and Decision Making in the references drawer.

Missing context

Effort usually matters. Whether it pays off also depends on direction, feedback, timing, starting resources, other people’s decisions and plain luck.

A counterexample

Months of hard work on the wrong problem, or on a skill that stopped being valued, can produce little reward. Success stories rarely list the people who worked just as hard elsewhere.

A better reading

Effort is often necessary and rarely sufficient. A kinder and more accurate version: steady effort, pointed in a direction that gets regular feedback, improves your odds.

House reading: It depends

Missing context

Age brings more experience, and experience can build judgment, especially in stable areas with clear feedback. It can also carry outdated assumptions when the area has changed.

A counterexample

Someone with decades in a trade may read people superbly yet be working from old rules about a tool that changed last year; a younger colleague may know the tool and misread the room.

A better reading

Ask what the experience was in, and whether that world still works the way it did. Respect for experience and curiosity about change sit together comfortably.

House reading: It depends

Missing context

Price reflects materials and labour, but also brand, scarcity, positioning, distribution and what the seller believes buyers will pay.

A counterexample

A plain, inexpensive tool can outlast a premium one bought mostly for its name; equally, a cheap item can cost more over time if it has to be replaced twice.

A better reading

Price is a noisy signal of quality. Comparisons on the things you actually care about, ideally without seeing the label, tell you more than the tag.

House reading: It depends

Missing context

Details make a story vivid and easy to picture. But each added detail is one more condition that must hold, so a more specific story can never be more probable than the plainer version it contains.

A counterexample

“The shop closed early” is at least as likely as “the shop closed early because the owner went to a cousin’s wedding”, however much more convincing the second sounds.

A better reading

Vividness and probability pull in different directions. When a story feels compelling, separate the parts that have been checked from the parts that merely sound right.

House reading: Mostly doesn’t hold

Missing context

Visible emotion and inner concern are only loosely connected. Temperament, training, custom, role and coping style all shape how feelings show.

A counterexample

A nurse speaking evenly during an emergency may care intensely; the calm is part of the job. Someone else may go quiet precisely because they are overwhelmed. (Illustrative.)

A better reading

Outward expression is a clue to read alongside context, not a gauge of how much someone cares. What people do over time usually says more.

House reading: Mostly doesn’t hold

Missing context

If people choose which class, programme or habit they join, the groups may differ in many ways besides the thing being compared. That makes it hard to say what caused any difference in outcomes.

A counterexample

It isn’t always misleading: sometimes the self-chosen groups happen to be similar on everything that matters. The trouble is that you usually can’t tell that from the comparison alone.

A better reading

Research-methods texts draw exactly this line between experiments that randomly assign people and quasi-experiments that use existing groups: without random assignment, a confounding difference (say, more motivated students picking a demanding teacher) may explain the result. The open question is how large the distortion is in a given case.

House reading: Mostly holds

Check it: Noba: Research Designs in the references drawer.

Missing context

Learning the name of a bias helps you recognise it in principle. Catching it in yourself, in the moment, under time pressure, is a different skill.

A counterexample

Plenty of people who can define anchoring are still pulled by an opening price. Knowing the trick doesn’t switch off the pull.

A better reading

Decision-making research summarised for students notes that early work found awareness alone did little to reduce bias. More helpful: slower, deliberate thinking for important choices, and changing the environment itself, for example with better defaults.

House reading: Mostly doesn’t hold

Check it: Noba: Judgment and Decision Making in the references drawer.

Missing context

How easily examples come to mind depends on how often something happens, but also on how vivid, recent, emotional or widely shared it was.

A counterexample

After a dramatic news story, a rare event can feel common simply because it is easy to picture, while a frequent but dull risk barely registers.

A better reading

Judging frequency by how readily examples surface is a useful shortcut that misleads in predictable ways; judgment research describes people leaning on information that is easy to retrieve. When it matters, look for a count.

House reading: It depends

Check it: Noba: Judgment and Decision Making in the references drawer.

Missing context

A single striking case is easy to remember and easy to over-weight. A larger record, gathered fairly, smooths out luck and shows the usual pattern.

A counterexample

“Fairly gathered” is doing real work. A large record of only the successes, or only the people who bothered to reply, can mislead more confidently than one honest anecdote.

A better reading

Accounts of decision-making often cite baseball professionals who over-weighted recent performance and what they saw with their own eyes, when multi-year records were the better guide. Big and fair beats small and vivid; big and biased is its own problem.

House reading: Mostly holds

Check it: Noba: Judgment and Decision Making in the references drawer.

Missing context

After an outcome, the signals that pointed towards it become easy to see, while the signals that pointed elsewhere fade. The past starts to look more predictable than it was.

A counterexample

Before the result, the same signals that now look like warnings sat alongside others pointing the opposite way, and reasonable people disagreed.

A better reading

Hindsight bias, claiming to have known beforehand what we only learned afterwards, is a recognised pattern in judgment research. The simplest defence is to write predictions down before outcomes are known.

House reading: Mostly doesn’t hold

Check it: Noba: Judgment and Decision Making in the references drawer.

Missing context

A complaint requires that people notice a problem, believe someone will listen, and judge that speaking up is worth the cost. Remove any one of those and silence follows, problem or not.

A counterexample

Unhappy customers may simply stop coming back rather than complain; colleagues who expect complaints to be held against them may stay quiet.

A better reading

Silence is weak evidence of satisfaction. Signals that don’t depend on people volunteering, such as asking directly or noticing who leaves, tell you more.

House reading: It depends

Missing context

A price of zero can hide other costs: time, attention, personal data, future lock-in, or obligations that arrive later.

A counterexample

A free app may be funded by advertising shaped by what it learns about you; a free trial may be designed to make the full purchase feel like a small next step.

A better reading

“Free” describes the price at the counter, not the total cost. Asking how the provider sustains itself usually reveals what you are paying with.

House reading: Mostly doesn’t hold

Missing context

Changing your mind because someone pressured you is one thing. Changing it because new evidence arrived is how learning is supposed to work.

A counterexample

A person who never revises any belief, whatever the evidence, isn’t demonstrating strength; they are simply not learning from anything new.

A better reading

Formal accounts of rational belief treat learning as updating: a prior degree of belief is revised in proportion to the strength of new evidence. Updating isn’t defeat; it is the mechanism of becoming less wrong.

House reading: Mostly doesn’t hold

Check it: SEP: Bayes’ Theorem in the references drawer.