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 evidence to its 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.
HUMAN ACCOUNTABILITY + AI USE RECORD
The owner is accountable; the technical checks were AI-assisted.
The TOOOLBOX site owner authorized the publication scope and remains the correction contact. AI assistance was used for drafting, implementation, arithmetic recomputation, and source-link checks. This record does not claim line-by-line human fact-checking or licensed professional review.
- Record ID
- TB-APT-14-20260902
- Owner role
- TOOOLBOX site owner and developer
- Technical check date
- 2026-09-02
- Human fact-check
- No separate human fact-check recorded
- AI use
- Drafting, code, arithmetic, and link checks
- 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
Test the result yourself.
This note preserves a dated calculation. Change the inputs in the live workspace, or compare another evidence pattern below. Live source availability and results can differ from the dated example.