Correction and editorial revision — 23 October 2026: This retrospective replaces the earlier mixed-time narrative with dated provider observations. A currency threshold alone did not establish Japanese inflation or a Bank of Japan response. The earlier causal explanations and trading implications are withdrawn; their removal is not a finding that every cited event was false. The original input file is unavailable. The cutoff below is the calendar day before the original publication date, selected for this reconstruction; it is not a claim about what was known when the original article was written.
This archive review uses observations available in the retrieved daily history on or before 2026-05-05. Each market has its own closing time. The question is: Does a Yen Level Establish a New Inflation Regime?
The measured comparison
USD/KRW moved from 1,471.73 on 2026-05-04 to 1,476.05 on 2026-05-05, a +0.29% change in won per dollar. Expressing the won’s dollar value instead requires taking the reciprocal: its change is -0.29%. Opposite quote conventions reverse direction and do not give exactly equal percentage magnitudes. USD/KRW history.
USD/JPY changed +0.22% over 2026-05-04–2026-05-05. Over five observation intervals, USD/KRW changed +0.21% and USD/JPY changed -1.36%. These are two currency pairs, not a broad dollar index or a yuan measure. KOSPI’s +5.12% daily return is a separate local-currency index observation, and does not identify foreign-investor purchases or intervention.
Reproducing the longer comparison
For USD/KRW, the five-interval baseline is 1,473.00 on 2026-04-28; the endpoint is 1,476.05 on 2026-05-05. The calculation is (endpoint ÷ baseline − 1) × 100 = +0.21%. This uses the endpoints directly rather than adding rounded daily percentages. Five observations need not correspond to one calendar week when a market is closed.
Source-linked daily observations
| Series | Previous date | Previous value | Date | Value | Change | Time zone |
|---|---|---|---|---|---|---|
| KOSPI (^KS11) | 2026-04-30 | 6,598.87 | 2026-05-04 | 6,936.99 | +5.12% | Asia/Seoul |
| S&P 500 (^GSPC) | 2026-05-04 | 7,200.75 | 2026-05-05 | 7,259.22 | +0.81% | America/New_York |
| Nasdaq Composite (^IXIC) | 2026-05-04 | 25,067.80 | 2026-05-05 | 25,326.13 | +1.03% | America/New_York |
| US 10-year yield proxy (^TNX) | 2026-05-04 | 4.446 | 2026-05-05 | 4.416 | -3.0 bp | America/Chicago |
| WTI futures (CL=F) | 2026-05-04 | 106.42 | 2026-05-05 | 102.27 | -3.90% | America/New_York |
| Gold futures (GC=F) | 2026-05-04 | 4,533.30 | 2026-05-05 | 4,568.50 | +0.78% | America/New_York |
| USD/KRW (USDKRW=X) | 2026-05-04 | 1,471.73 | 2026-05-05 | 1,476.05 | +0.29% | Europe/London |
| USD/JPY (USDJPY=X) | 2026-05-04 | 156.85 | 2026-05-05 | 157.19 | +0.22% | Europe/London |
| VIX (^VIX) | 2026-05-04 | 18.29 | 2026-05-05 | 17.38 | -4.98% | America/Chicago |
Scope and limitations
Returns are calculated before rounding from Yahoo Finance daily history, not independently verified exchange settlement records. Index values are in points; the yield proxy is quoted in percent; currency quotes are local units per US dollar; gold and WTI futures are dollars per ounce and barrel. Futures-series changes can reflect contract rolls and are not a continuously held contract’s investment return. These are retrospective observations, not live prices or a reconstruction of every intraday quote available to the original author.
For the underlying method, see the trading-session and return guide. This page retains its original address for correction transparency. The title and text now reflect the narrower evidence available; the old URL wording should not be treated as a current claim. No trading instruction is retained.
