Y12W12VC When to stop looking

You're flat-hunting. You've seen six so far. The sixth is actually pretty good — tempting enough that you're about to commit — but there are four more booked in on Saturday. What if the perfect flat is still ahead? You hesitate. You see the others. They're mediocre. You try to go back. The sixth is gone. This week's article examines a surprisingly precise mathematical answer to the question of when to stop looking.

Core Vocabulary

optimal

/ˈɒptɪməl/|op·ti·mal

adj

The best possible; most desirable or effective under given circumstances; achieving the highest value or outcome in a decision or search.

Word Breakdown: opt- (choice, Latin) + -imal (best/most)

Word family: optimum (n.), optimal (adj.), optimally (adv.), optimise (v.)

Synonyms: best, ideal, peak

Collocations: optimal solution, optimal choice, optimal stopping

Example: The 37% rule is a strategy that maximises your probability of selecting the optimal candidate.

In the articleHow do you maximise the chance of picking the best candidate?

sequential

/sɪˈkwenʃəl/|se·quen·tial

adj

Arranged in or following a logical series; occurring one after another in order without gaps. Sequential describes processes that unfold in stages.

Word Breakdown: sequ- (follow, Latin) + -ential (relating to)

Word family: sequence (n.), sequential (adj.), sequentially (adv.)

Synonyms: successive, ordered, progressive

Collocations: sequential search, sequential process, sequential order

Example: Flat-hunting is a sequential search where you view candidates one at a time.

In the articleYou're interviewing a sequence of candidates for a job.

sampling

/ˈsæmplɪŋ/|sam·pling

noun

The process of examining or testing a subset or representative group; gathering information from a portion rather than the whole.

Word Breakdown: sam- (sample/take) + -pling (the act of)

Word family: sample (n., v.), sampling (n.), samples (n.)

Synonyms: surveying, testing, examining

Collocations: sampling phase, sampling strategy, sampling data

Example: The 37% rule recommends a sampling phase before you commit to a choice.

In the articleYou should observe — without hiring — roughly the first 37 per cent of the candidates.

counterintuitive

/ˌkaʊntərɪnˈtuːɪtɪv/|coun·ter·in·tu·i·tive

adj

Contrary to what one would naturally expect or intuitively believe; surprising because it contradicts immediate intuition or common sense.

Word Breakdown: counter- (against) + intuitive (immediately understood)

Word family: counterintuitive (adj.), counterintuitively (adv.), counterintuition (n.)

Synonyms: surprising, unexpected, paradoxical

Collocations: counterintuitive result, counterintuitive answer, counterintuitive finding

Example: The optimal stopping rule is counterintuitive: rejecting the first 37% feels wrong but maximises success.

In the articleIt has an elegant, specific, and counter-intuitive answer.

elegant

/ˈelɪɡənt/|el·e·gant

adj

Graceful and stylish in appearance or manner; marked by simplicity and neatness in solving a problem or explaining a concept.

Word Breakdown: eleg- (choice, Latin) + -ant (characterized by)

Word family: elegant (adj.), elegance (n.), elegantly (adv.)

Synonyms: graceful, refined, neat

Collocations: elegant solution, elegant approach, elegant proof

Example: The 37% rule is an elegant solution to the problem of knowing when to commit.

In the articleIt has an elegant, specific, and counter-intuitive answer.

commitment

/kəˈmɪtmənt/|com·mit·ment

noun

A binding choice or decision; a promise or obligation to follow a course of action; the moment of deciding to act on one option.

Word Breakdown: com- (together, Latin) + mitt- (send/place) + -ment (the result)

Word family: commit (v.), commitment (n.), committed (adj.)

Synonyms: decision, pledge, obligation

Collocations: make a commitment, commitment to, time commitment

Example: After viewing enough candidates, you must make a commitment to one.

In the articleEach candidate must be either hired or rejected on the spot — no going back.

forgo

/fɔːrˈɡoʊ/|for·go

vb | [forgoes, forgo, forgoing, forgone]

To pass up, decline, or refrain from; to choose not to have or do something despite having the opportunity.

Word Breakdown: for- (forward/away, Latin) + go (go)

Word family: forgo (v.), foregone (adj.), forgoing (adj., n.)

Synonyms: pass up, skip, waive

Collocations: forgo the option, forgo the opportunity, willing to forgo

Example: When you commit to one flat, you forgo the chance to see others.

In the articleThe opportunity cost of not acting on what you already have.

mediocre

/ˌmiːdiˈoʊkər/|me·di·o·cre

adj

Of only moderate quality; neither good nor bad; ordinary and unremarkable in performance or value.

Word Breakdown: medi- (middle, Latin) + -ocre (moderate)

Word family: mediocre (adj.), mediocrity (n.), mediocrely (adv.)

Synonyms: ordinary, average, unremarkable

Collocations: mediocre quality, mediocre option, mediocre choice

Example: The seventh flat was mediocre, so the searcher regretted not committing to the sixth.

In the articleYou see it; it's mediocre.

Technical Terms

optimal stopping problem

/ˈɒptɪməl ˈstɒpɪŋ ˈprɒbləm/|op·ti·mal stop·ping prob·lem

noun phrase

The mathematical decision problem of determining when to stop searching or sampling in a sequential process to maximise the probability of selecting the best option. The classic formulation is known as the secretary problem.

Synonyms: secretary problem, optimal search strategy, sequential decision problem

Collocations: optimal stopping rule, solve the optimal stopping problem, optimal stopping strategy

Example: Job candidates, romantic partners, and career options all present the optimal stopping problem — knowing when to commit rather than continuing to search.

In the articleThis is an almost universal experience, and it has a name in decision theory. It's called the secretary problem, or the optimal stopping problem.

secretary problem

/ˈsekrɪteri ˈprɒbləm/|sec·re·tar·y prob·lem

noun phrase

The classical mathematical formulation of the optimal stopping problem, posed as: select the best candidate from a random sequence when each candidate must be accepted or rejected immediately without knowing future candidates. The optimal strategy is the 37% rule.

Synonyms: optimal stopping problem, candidate selection problem, marriage problem

Collocations: secretary problem solution, secretary problem maths, secretary problem rule

Example: The secretary problem demonstrates that rejecting the first 37% of candidates and then hiring the first superior candidate maximises your probability of selecting the best one.

In the articleThe problem was first formalised in the 1960s by the mathematician Martin Gardner.

37% rule

/ˌθɜːrti səˈvən pərsent rool/|thir·ty sev·en per·cent rule

noun phrase

The mathematical result that maximises your probability of selecting the best candidate: reject the first 37% of candidates without hiring, then hire the first candidate who exceeds all previously seen candidates. Derived from the reciprocal of the mathematical constant e.

Synonyms: 37 percent strategy, optimal threshold rule, Bezos rule

Collocations: apply the 37% rule, follow the 37% rule, the 37% rule suggests

Example: When selecting among candidates, the 37% rule recommends sampling the first 37% to establish a baseline, then accepting the next candidate who surpasses all those you have seen.

In the articleYou should observe — without hiring — roughly the first 37 per cent of the candidates, tracking who was best among them.

exploration phase

/ˌekspləˈreɪʃən feɪz/|ex·plo·ra·tion phase

noun phrase

The early sampling period in a sequential search during which options are examined without commitment to determine the distribution and quality of available options.

Synonyms: sampling phase, investigation period, reconnaissance stage

Collocations: exploration phase ends, during the exploration phase, exploration phase strategy

Example: During the exploration phase of flat-hunting, you look at properties without binding commitment to understand the market's quality and range.

In the articleYou should observe — without hiring — roughly the first 37 per cent of the candidates.

opportunity cost

/ˌɒpərˈtjuːnɪti kɔːst/|op·por·tu·ni·ty cost

noun phrase

The value of the best alternative foregone when making a choice; what you give up by committing to one option instead of another.

Synonyms: foregone benefit, alternative value, cost of choosing

Collocations: opportunity cost of, calculate opportunity cost, consider opportunity cost

Example: The opportunity cost of continuing to view flats is the rental payments you'll make while searching, the stress of uncertainty, and the risk that good options disappear.

In the articleThe opportunity cost of not acting on what you already have.

Figurative Phrases

the one

The right person or option; the perfect choice. Used idiomatically to refer to an idealized singular option with implied specialness and inevitability.

Etymology/Type: Idiomatic noun phrase; refers to the perfect choice or right person—a singular, special option.

Synonyms: the perfect option, the right choice, the ideal match

Example: She kept rejecting university options, waiting for the one that felt exactly right — but perfect fit rarely exists.

In the articleWhat if the perfect flat is still ahead?

keep looking

To continue searching without commitment; to delay deciding and continue sampling. Though apparently literal, the phrase carries the idiomatic meaning of continuing without binding action.

Etymology/Type: Idiom; continue searching for a better option without committing to current choices.

Synonyms: search on, hold out for more, delay choosing

Example: He kept looking at different study methods instead of committing to one and practising it consistently.

In the articleThere are four more booked in on Saturday, and what if one of those is better?

sell yourself short

To settle for less than you deserve; to underestimate your own value or accept a suboptimal option when better alternatives exist. 'Sell' is figurative, not literal.

Etymology/Type: Idiom; to underestimate your own value—settle for less than you deserve.

Synonyms: undervalue yourself, settle for less than you deserve, underestimate what you bring

Example: By not applying to the advanced class, she was selling herself short — she was more than capable of the work.

In the articleThe first one was alright but the light was wrong.

hold out for

To wait or persist in seeking something better; to refuse to accept less than desired and continue searching. 'Hold out' is figuratively about resistance and waiting.

Etymology/Type: Idiom; wait or persist in seeking something better—refusing to accept less.

Synonyms: wait for something better, insist on the ideal, refuse to settle

Example: She held out for a work experience placement that genuinely interested her, even though easier options were available.

In the articleWhat if the perfect flat is still ahead?

pull the trigger

To commit to a decision or take decisive action; to move from deliberation to action. No literal trigger is involved; the metaphor suggests both urgency and finality.

Etymology/Type: Firearms idiom; pulling the trigger commits you to action—take a decisive decision.

Synonyms: commit to it, make the call, decide and act

Example: After weeks of comparing options, he finally pulled the trigger and enrolled in the course he'd wanted all along.

In the articleGood enough that you're tempted to sign.

settle for

To accept or agree to something less than ideal; to commit to a suboptimal option when perfect options are unlikely. 'Settle' is figurative, referring to accepting rather than literally coming to rest.

Etymology/Type: Idiom; accept something less than ideal—commit to an imperfect choice.

Synonyms: make do with, accept less than ideal, take what's available

Example: Rather than settling for a topic she didn't care about, she negotiated with the teacher for a more relevant question.

In the articleThe sixth one is actually pretty good — good enough that you're tempted to sign.

Confusing Words

optimal vs. optimum

These word-family forms differ by part of speech: optimal is primarily an adjective describing the best condition, while optimum is primarily a noun naming that best state itself.

  • Optimal is an adjective meaning 'most desirable, best possible under given circumstances' — the 37% rule maximises your probability of selecting the optimal candidate in a sequential search.
  • Optimum is a noun meaning 'the most desirable level or state of something' — we reached the optimum when the mathematical model revealed the 37% threshold.

If you're describing a noun (the best solution, the best choice), use optimal (the adjective). If you're naming the best state or level itself, use optimum (the noun). Try this: can you say 'in [word]'? If yes ('in optimum'), it's a noun; if no, it's probably the adjective (optimal).

sequential vs. consecutive

These near-synonyms both involve order, but sequential means 'in logical order' while consecutive means 'one after another without any gaps'.

  • Sequential means 'arranged in or following a logical series; occurring one after another in order' — flat-hunting is a sequential search where you view candidates one at a time in some order.
  • Consecutive means 'following one after another without gaps; continuous in succession' — viewing flats on three consecutive Saturdays means you viewed them on Saturday 1, Saturday 2, and Saturday 3 with no breaks.

All consecutive events are sequential, but not all sequential events are consecutive. Consecutive = unbroken sequence (1, 2, 3, 4). Sequential = ordered but can have gaps (1, 3, 5, 7). If there are interruptions or skips, use sequential. If they flow unbroken, use consecutive.

commitment vs. obligation

These nouns both involve binding oneself to action, but commitment emphasizes voluntary choice and dedication, while obligation emphasizes external duty or legal requirement.

  • Commitment means 'a binding choice or decision; a pledge or dedication to follow a course of action' — after viewing the first 37% of flats, you make a commitment to the next candidate who exceeds them.
  • Obligation means 'a binding duty; something legally or morally required' — the landlord has an obligation to maintain safe living conditions under tenant law.

Commitment involves your choice and dedication (I am committed to this project = I choose it). Obligation involves external duty (I have an obligation to = something requires it of me). If you can replace it with 'duty' or 'requirement', use obligation. If it means 'pledge' or 'promise', use commitment.