REPRODUCIBLE WORK
Follow the evidence in the order it becomes usable.
Read source fields
Transaction amount + exclusive-use area
Two differently sized homesNormalize A
₩720M ÷ 59.9㎡
About ₩12.02M/㎡Normalize B
₩930M ÷ 84.9㎡
About ₩10.95M/㎡Interpret
A normalized rate − B normalized rate
A is about 9.8% higher per ㎡ despite the lower total priceSOURCE SNAPSHOT
Anchor the event to a source and time.
INPUT AND EVIDENCE LEDGER
Keep the snapshot attached to its origin.
| Field | Value | Origin |
|---|---|---|
| Record A | ₩720M / 59.9㎡ | Controlled fixture using official fields |
| Record B | ₩930M / 84.9㎡ | Controlled fixture using official fields |
| Area field | Exclusive-use area | MOLIT transaction schema |
| Comparison | Won per exclusive-use ㎡ | APT transformation |
DECISION READING
What survives the timeline check.
Total price answers an affordability question; price per square metre answers a different comparability question. APT should show both and still avoid treating units with different floor, orientation, condition, or date as identical.
SENSITIVITY
Where the chain can go stale.
- Using gross floor area instead of exclusive-use area would change the denominator.
- Renovation, floor, view, and transaction month can dominate the normalized difference.
- Narrower area buckets improve comparability but reduce sample size.
BOUNDARIES
Do not extend the timestamp into a promise.
- The pair is a calculation fixture, not a named-property valuation.
- Per-square-metre normalization does not make two units fully comparable.
- Only reported transactions, not listings, belong in this evidence layer.
OWNER AUTHORIZATION + VERIFICATION RECORD
One accountable operator and a reproducible check record.
The TOOOLBOX site owner authorized this publication scope and remains the correction contact. The checks below were completed during preparation with AI-assisted implementation; they are an audit record, not a claim of licensed professional review.
- Review ID
- TB-APT-14-20260902
- Owner role
- TOOOLBOX site owner and developer
- Release scope
- Owner-authorized · 2026-09-02
- Correction channel
- Public contact page
- Verified the official interface exposes price and exclusive-area fields.
- Recomputed both normalized values and the percentage difference.
- Added non-area comparability limits before publication.
MORE APT DECISION NOTES
Compare another evidence pattern.
The related notes deliberately use different questions, data states, and editorial forms.