Published: September 27, 2026 at 12:46 PM
Weekly Market Memory
Weekly Market Memory
1. Weekly Summary
AI chips overpowered the surge in yields. On Monday, Meta's AI agent 'Muse' climbed to No. 1 among free iOS apps in the U.S. just 13 days after launch, feeding a narrative that "mass adoption of agents will further boost chip demand," and as AMD topped $1 trillion in market cap for the first time, the semiconductor ETF rose +6.01% on Monday and Tuesday alone. Semiconductors finished the week +5.86% and the tech sector +3.64%, while the Nasdaq, after back-to-back record closes on Monday and Tuesday, ended the week +2.06% (27,068.72). The same momentum spread to Korea. Hard data showing chip exports +259.4% for Sept. 1-20, combined with a stronger won (USD/KRW 1,354.40 won, -1.82%), lifted the KOSPI +2.71% and the Korea ETF +3.24%, recovering much of the prior week's -3.93% decline.
A single day, Wednesday, changed the character of the week. When the September composite PMI hit 58.4, the highest since July 2021, the 10-year yield jumped from 4.97% to 5.11% in one day, and the 5-year topped 5% for the first time since 2007. Yields kept climbing into the weekend, with the 10-year at 5.18% (intraweek high 5.23%) and the 30-year at 5.50%, the highest since 2004. As a result, long-term Treasuries -2.38%, gold futures -2.34% and utilities -3.16% fell in tandem, and the Russell 2000 slipped -0.80%, lagging the Nasdaq by 2.86 percentage points. The S&P 500's weekly gain of +1.21% came almost entirely from Monday (+1.49%); from Tuesday through Friday it was -0.27%. Strong economic data pushes yields higher, and those yields weigh on everything outside the AI megacaps.
Sept. 30 (Wed) is the inflection point. Micron's earnings, the federal budget deadline and the deadline for a decision on copper import tariffs all fall on the same day. If Micron reconfirms the AI memory supply shortage, semiconductors' stop-loss cushion (10.28%) can absorb a pullback; but if guidance falls short of expectations, an index that had only one reason to hold up with yields in the 5% range will wobble. If a shutdown materializes, the Oct. 2 jobs report would be delayed, and the bond market, already pricing roughly 70% odds of an October hike, could push yields higher without data to go on.
2. Review of Last Week's Outlook
| Prior-Week Outlook | Actual Outcome | Verdict |
|---|---|---|
| The U.S.-China summit (9/24) will decide the fourth week of the chip rally | The rally continued (semiconductor ETF +5.86%, stop-loss cushion 5.29% → 10.28%). But most of the gain came on Monday and Tuesday before the summit (+6.01%), driven by Meta's Muse and AMD's $1 trillion milestone, and Friday, the day after the summit, gained only +1.01%. The summit ended with a two-month extension of the trade truce | Partial hit |
| If the 10-year breaks back above 5%, declines in the three rate-sensitive sectors will continue | The 10-year broke back above at 5.18% (intraweek high 5.23%). Utilities -3.16%, financials -1.47%, REITs -1.45%: all three sectors in the bottom tier for a second straight week | Hit |
| If the 30-year is contained, long-term Treasuries stay positive | The 30-year rose from 5.33% to 5.50%, and the long-term Treasury ETF reversed to -2.38% | Miss |
| Whether copper strength holds until the tariff decision (9/30) | It held, with copper futures +1.36% and the copper ETF +0.94%, but the industrial metals basket was flat at -0.04%. The copper ETF lost its entry condition on 9/24 for a day before regaining it | Partial hit |
| WTI $140 scenario on a renewed Hormuz blockade or escalation | There was no renewed blockade and WTI fell -7.87% ($92.41). Brent, however, rose +0.43% ($104.32), holding above $100, and spiked to an intraweek high of $108.23 | Miss |
| Stagflation driven by further Fed tightening | The rate path played out as forecast (30-year at its highest since 2004, roughly 70% odds of an October hike). But with PMI at 58.4 and jobless claims at a 57-year low, there were no signs of slowing growth, and healthcare held up defensively at +1.76% | Partial hit |
| Yen carry trade unwind | USD/JPY at 157.18 (+0.67%, intraweek high 159.00); yen weakness persisted with no sign of an unwind | Miss |
| Further damage to Korean assets from won weakness (return to the 1,400 won range) | The won actually strengthened, with USD/KRW at 1,354.40 won (-1.82%). KOSPI +2.71%, Korea ETF +3.24% | Miss |
3. Portfolio Drift & Risk
Weekly Portfolio Drift
Of the four asset classes, only equities rose. With the 10-year up 0.18 percentage points in a week, long-term Treasuries (-2.38%) fell the most, and as rising yields combined with a stronger dollar (DXY +0.75%), non-yielding gold (-1.93%) fell as well. Energy, as WTI dropped -7.87% on hopes of renewed U.S.-Iran diplomacy and a recovery in Saudi exports, fell -2.96%, the worst of the four asset classes. Stocks and bonds diverged because of where the rise in yields came from. Economic strength, in the form of a PMI surprise and jobless claims at a 57-year low, lifted yields, so only AI megacaps with assured earnings growth could overcome the rate burden. That is why, even within equities, the Nasdaq 100 (QQQ +3.30%) and the Russell 2000 (-0.80%) diverged sharply. In a week when bonds, gold and energy all fell at once, the performance of diversified portfolios hinged on their equity weighting, and in particular their tech weighting.
| Asset Class | Representative Ticker | Weekly Return | Notes |
|---|---|---|---|
| Equities | SPY | +1.27% | Reached the weekly high zone on Monday, then pushed back by the Wed-Thu rate shock. Closed at 771.35 |
| Fixed Income | TLT | -2.38% | 10-year 5.18%, 30-year 5.50%. Down in 4 of 5 trading days |
| Gold | GLD | -1.93% | -1.80% on Wednesday's rate-spike day alone. Double burden of a stronger dollar and rising real yields |
| Energy | XLE | -2.96% | WTI -7.87%. Diplomatic hopes were priced in first, with -2.30% on Monday alone |
Risk Analysis
| Indicator | Value | Meaning/Context |
|---|---|---|
| VIX (Fear Index) | 14.87 (weekly +0.41%, high 16.57 / low 14.12) | At the low end of the normal 12-18 range. The fear gauge barely reacted to the rate tantrum. The Nasdaq volatility index (VXN), by contrast, rose to 20.87 (+8.19%), showing increased demand for hedges against tech declines even as the index climbed |
| 10Y Treasury Yield | 5.18% (weekly +0.18pp, high 5.23% / low 4.93%) | Near the highest since 2007. The 30-year at 5.50% is the highest since 2004. Long-dated yields rose more than the 3-month (4.07%), steepening the curve |
| Weekly Max Drawdown | -1.54% (S&P 500 intraweek high 7,782.19 → low 7,662.57) | On a closing basis, 09-21 7,764.70 → 09-24 7,704.13, -0.78%. The index drawdown was shallow relative to the size of the rate shock |
| 2-Week Cumulative S&P 500 | +1.13% (7,656.98 → 7,743.41) | -0.08% the prior week, then +1.21% this week. The Dow snapped a three-week losing streak |
| Regime | neutral | Equities risk_on (Nasdaq at record highs, VIX around 15), bonds and gold risk_off (long-term Treasuries and gold fell together). A week of mixed signals across asset classes |
4. Sector Performance
| Sector | Ticker | Weekly Return | Notes |
|---|---|---|---|
| Semiconductors | SMH | +5.86% | No. 1. Meta's Muse success carried through to AMD's $1 trillion market cap, and Friday's $11.6 billion Akamai-Anthropic deal reaffirmed broadening AI infrastructure demand |
| Technology | XLK | +3.64% | No. 2. Same driver as semiconductors. Made most of its weekly gain on Monday and Tuesday and held up with a shallow loss on the rate-spike day (-0.47%) |
| Communication Services | XLC | +2.27% | No. 3. Meta lifted the sector twice, with Muse's success and its 9/24 Connect event (the 'Muse Charm' wearable). Up +1.27% on Thursday, the only gainer amid the rate shock |
| Healthcare | XLV | +1.76% | Positive for a second straight week. A defensive sector with low rate sensitivity; newly met its entry condition on Friday |
| Industrials | XLI | +0.67% | Rebounded +0.95% on Friday. Benefited from solid jobs data |
| Materials | XLB | +0.08% | Copper strength offset by the rate burden |
| Consumer Discretionary | XLY | -0.21% | -1.50% on Wednesday under the burden of rising mortgage rates |
| Consumer Staples | XLP | -0.24% | Sidelined as defensive demand flowed to healthcare |
| REITs | XLRE | -1.45% | Direct casualty of the 10-year breaking back above 5%. -1.55% on Wednesday |
| Financials | XLF | -1.47% | Third from the bottom. Bank stocks, which should have gained from a steeper curve, fell instead. Tuesday's -1.97% suggests the fallout from lowered investment banking fee guidance outweighed the rate burden |
| Energy | XLE | -2.96% | Second from the bottom. WTI -7.87% on hopes of renewed U.S.-Iran diplomacy and recovering Saudi crude exports (2.4 million barrels in August → more than 4 million in September) |
| Utilities | XLU | -3.16% | Last, for a second straight week. As a dividend sector it is the most sensitive to long-term yields, and a credit rating downgrade of Edison International added to the pressure. -1.92% on Wednesday alone |
5. Week at a Glance
| Date | Market Summary | S&P 500 | NASDAQ | VIX | WTI | Regime |
|---|---|---|---|---|---|---|
| 09-21 (Mon) | Nasdaq posted its first record close since June on U.S.-Iran diplomatic hopes and Meta's Muse success; semiconductors +4.02% | 7,764.70 | 27,122.09 | 14.87 | $95.78 | risk_on |
| 09-22 (Tue) | S&P flat amid Trump's UN speech; Nasdaq set another record as AMD hit a $1 trillion market cap; VIX at weekly low | 7,764.64 | 27,244.28 | 14.21 | $94.59 | risk_on |
| 09-23 (Wed) | PMI surprise of 58.4 sent the 10-year to 5.11% and the 5-year above 5% for the first time since 2007; S&P -0.75% | 7,706.03 | 26,936.04 | 15.18 | $92.16 | risk_off |
| 09-24 (Thu) | 30-year at 5.46%, highest since 2004; indexes flat on the day of the Trump-Xi summit as Brent spiked | 7,704.13 | 26,939.37 | 15.67 | $94.61 | neutral |
| 09-25 (Fri) | Jobless claims at a 57-year low and the Akamai-Anthropic deal lifted the Dow +0.93%, ending a three-week losing streak | 7,743.41 | 27,068.72 | 14.87 | $92.41 | risk_on |
| 09-26 (Sat) | Market closed — based on the prior trading day's (09-25) close | 7,743.41 | 27,068.72 | 14.87 | $92.41 | — |
| 09-27 (Sun) | Market closed — based on the prior trading day's (09-25) close | 7,743.41 | 27,068.72 | 14.87 | $92.41 | — |
6. Trading Signal Changes
Week-Start vs. Week-End Signal Comparison
| ETF | Asset Class | Week-Start Entry Condition | Week-End Entry Condition | Change | Week-End Trail Buffer |
|---|---|---|---|---|---|
| SPY | Core | Met | Met | → | 29.22% |
| QQQ | Core | Met | Met | → | 29.49% |
| XLK | Core | Met | Met | → | 29.00% |
| SMH | Theme | Met | Met | → | 10.28% |
| BOTZ | Theme | Not met | Not met | → | 4.91% |
| EWY | Theme | Not met | Met | ↑ (met, lost and regained during the week) | 4.74% |
| XLV | Theme | Not met | Met | ↑ | 17.03% |
| XLE | Theme | Not met | Not met | → | 14.32% |
| AIPO | Theme | Met | Met | → | 2.90% |
| ROKT | Theme | Not met | Not met | → (met for one day on 09-22) | -2.08% |
| GLD | Safe Haven | Not met | Not met | → | -5.06% |
| TLT | Safe Haven | Not met | Not met | → | 4.64% |
| CPER | Commodities | Met | Met | → (lost for one day on 09-24) | 12.81% |
| DBB | Commodities | Met | Met | → | 12.08% |
Rebalancing Actions
Hold, restore normal weight
The prior-week report's call to confirm "whether the recovery holds into next week" has been satisfied. The ETF met its entry condition on all five trading days, and its stop-loss cushion widened to 10.28%. However, the Nasdaq volatility index rose +8.19%, signaling more demand for downside hedges, and Micron reports on Sept. 30, so additional buying is deferred until after earnings.
Hold
The stop-loss cushion is ample at 29.00%. It held at -0.47% even on the rate-spike day, showing that AI earnings are offsetting the discount-rate burden.
Hold
Both continue to meet entry conditions, with stop-loss cushions in the 29% range. SPY, however, made its entire weekly gain on Monday and went nowhere over the remaining four sessions.
Accumulate, scale in
Newly met its entry condition on Friday, with a wide stop-loss cushion of 17.03%. As a defensive sector that posted a gain in a week when rate-sensitive sectors fell across the board, it is an alternative if yields stay in the 5% range. Since this is the first day of meeting the condition, enter in tranches.
Hold
Downgraded one notch from the prior week's Accumulate. It lost its entry condition for a day on Thursday before regaining it, and the Sept. 30 tariff decision is a binary event that could swing direction sharply either way. The 12.81% stop-loss cushion remains healthy.
Hold
Tied to the same event as copper. The stop-loss cushion is in the stable zone at 12.08%, but weekly momentum has stalled.
Watch, half size or less
The weekly return was good, but the entry condition wobbled, met on Tuesday, lost on Thursday and regained on Friday, and the 4.74% stop-loss cushion is below 5%. The debates also recommended half size three days in a row. Since only the U.S.-listed ETF traded while the KOSPI was closed for the Chuseok holiday (9/24-25), first check the direction of the gap after the KOSPI reopens on Sept. 28.
Watch, hold off on entry
It met its entry condition all week, but its stop-loss cushion was stuck at 2.29-4.19% and its technical score is below the threshold. All seven debates this week ended in SKIP.
Watch
The stop-loss cushion recovered to 6.38% on Monday and Tuesday before Wednesday's rate spike pushed it back to 4.65%. In a week when semiconductors rose +5.86%, robotics/AI gained only +0.83%, widening the gap within the theme further than the prior week.
Trim
The entry condition remained unmet and WTI fell -7.87%. Brent held above $100, so supply risk has not fully disappeared, but with no trend condition in place, the case for maintaining the weight is weak.
Exit
The stop-loss cushion fell below 5% to 4.75% on Thursday and narrowed further to 4.64% on Friday. With the 30-year hitting its highest since 2004, holding long-term Treasuries is a source of losses, not a hedge.
Exit
The stop-loss cushion deepened from -3.71% to -5.06%. Last week we kept holding it as a hedge, but in a week of rising yields and a stronger dollar, gold failed to act as a hedge.
Exit
It met its entry condition for one day on Tuesday, but its stop-loss cushion was negative all week (-1.76 to -2.46%). Stay on the sidelines.
Weekly Signal Events
- New entry conditions met: EWY (09-22, re-met 09-25), ROKT (09-22), XLV (09-25), CPER (re-met 09-25)
- Entry conditions lost: ROKT (09-23), EWY (09-24), CPER (09-24)
- Entered trail risk zone (stop-loss cushion below 5%): BOTZ (09-23, 6.38% → 4.65%), EWY (09-23, 7.20% → 4.05%, down to 2.63% on 09-24), TLT (09-24, 5.93% → 4.75%)
- Trail risk cleared: SMH (09-21, 5.29% → 8.72%), BOTZ (09-21, 4.22% → 5.92%, re-entered the risk zone two days later)
- Below 5% all week: AIPO, GLD, ROKT, AVGO (1.02-3.90%), SPCX (negative)
- Single-stock note: MU widened its stop-loss cushion from 10.95% to 16.25%, ending the week in its healthiest shape ahead of earnings
Weekly Debate Review
| Date | Symbol | Verdict | Headline | Subsequent Weekly Move | Review |
|---|---|---|---|---|---|
| 09-22 | SMH | REDUCE (0.5×) | Chip demand-broadening narrative holds, but SOXX overextension risk remains unresolved | +1.77% | Hit. Rode the gain at half size, and the stop-loss cushion widened from 8.72% to 10.28% |
| 09-22 | AIPO | SKIP (0.0×) | trail buffer below 4% + tech integrity 5.0 below threshold | -0.76% | Hit. The price slipped despite meeting the condition |
| 09-23 | EWY | REDUCE (0.5×) | Chip export supercycle holds, but MA50 overextension + 9/24 event risk make entry timing vulnerable | -2.82% | Partial hit. The buy direction was wrong, but the mean reversion flagged by the Bear came the very next day, and half sizing cut the loss in half |
| 09-23 | AIPO | SKIP (0.0×) | Technical score 5.0, below 30. SKIP by rule | -1.54% | Hit |
| 09-23 | ROKT | SKIP (0.0×) | trail buffer -1.9%, technical score 5.0. SKIP by rule | -0.23% | Hit. Lost its entry condition again within a day |
| 09-24 | EWY | REDUCE (0.5×) | Chip export supercycle + bullish MA alignment hold, but accompanied by Treasury-yield-driven risk-off and an ultra-thin 4.05% trail | +0.82% | Hit. Entering at half size near the rate-shock low captured the rebound, and the stop-loss line was not touched even on Thursday, when the cushion narrowed to 2.63% |
| 09-24 | AIPO | SKIP (0.0×) | trail buffer 2.84%, technical score 5.0. SKIP by rule | +0.07% | Hit. No missed gains |
| 09-25 | AIPO | SKIP (0.0×) | trail buffer 2.29%, technical score 5.0. SKIP by rule | +0.73% | Hit. The missed gain was small, and the stop-loss cushion remains below the threshold |
| 09-26·27 | AIPO | SKIP (0.0×) | trail buffer 2.9%, technical score 5.0. SKIP by rule | — | Cannot be judged. Weekend debate with no subsequent trading days |
Weekly Wrap-Up from a Strategy Perspective
In a week when yields rose to 20-year highs, the strategy universe actually broadened. Names meeting entry conditions rose from 7 to 9, and the three core ETFs plus two semiconductor and commodity names all moved into the stable zone with stop-loss cushions above 10%. What broke down was safe havens. The long-term Treasury cushion fell below 5% and gold's negative cushion deepened, and the signals confirmed that the traditional hedge of "retreat to bonds and gold when stocks wobble" does not work in this rate regime. The key variables for next week's strategy are Micron's earnings and the tariff decision, which the two pillars, semiconductors and copper, face on the same day (Sept. 30).
7. Weekly Sentiment Trend
| Date | Reddit Verdict | Key Topics |
|---|---|---|
| 09-21 (Mon) | Mixed | Strength in semiconductors and bitcoin at $84K vs. the Chevron CEO's warning of prolonged high oil prices and hawkish Fed remarks |
| 09-22 (Tue) | Mixed | Euphoria over AMD at $1 trillion, Meta's Muse and bitcoin's breakout vs. anxiety over diesel prices and a $40 trillion fiscal deficit |
| 09-23 (Wed) | Bullish | The Meta Muse rally was the top topic, though caution coexisted, likening deteriorating breadth, with the equal-weight index down 5% and new lows outnumbering new highs, to 1999 |
| 09-24 (Thu) | Bearish | The 10-year surge and expectations of another hike in October; WSB loss posts and self-deprecation |
| 09-25 (Fri) | Bearish | The 30-year at its highest since 2004 and hike odds above 70% were common worries. Big Meta gain posts were the only exception |
| 09-26 (Sat) | Mixed | "Bonds beat stocks" defensive view vs. bullish view on the Akamai-Anthropic deal; $390 million hack of the Bitget exchange |
| 09-27 (Sun) | Neutral | AI bubble debate over "everyone knows it's overvalued, so why doesn't it collapse?"; caution over peak long-term yields and slowing home prices |
8. Daily Summaries
| Date | Day | One-Line Summary | Link |
|---|---|---|---|
| 09-21 | Mon | Chip exports +259.4% and strength in Samsung Electronics lifted the KOSPI to 7,007.72 (+1.65%), reclaiming 7,000 for the first time in 7 trading days | Daily Report |
| 09-22 | Tue | U.S.-Iran diplomatic hopes lifted the Nasdaq to 27,122.09 (+2.26%), its first record since June; semiconductors +4.02% | Daily Report |
| 09-23 | Wed | Meta's Muse success carried through to AMD's $1 trillion market cap, pushing the Nasdaq to a new high of 27,244.28; KOSPI 7,017.91 (+0.15%) | Daily Report |
| 09-24 | Thu | PMI surprise sent the 10-year to 5.11%, S&P -0.75%. KOSPI closed at 7,080.92 (+0.90%) before the Chuseok holiday | Daily Report |
| 09-25 | Fri | 30-year at 5.46%, highest since 2004; with indexes flat, only communication services gained +1.27% on the Meta Connect effect | Daily Report |
| 09-26 | Sat | Dow +0.93% ended a three-week losing streak; U.S.-China trade truce extended by two months; 10-year at 5.18% | Daily Report |
| 09-27 | Sun | Market closed. Wrapped up a week in which AI chips propped up the indexes amid a shift in the rate regime (10-year 5.18%, 30-year 5.50%) | Daily Report |
9. Next Week's Outlook
Key Scheduled Events
- 09-28 (Mon): KOSPI reopens after the Chuseok holiday. The chip rally and the extended U.S.-China truce, which could not be priced in during the three-day closure, will be reflected all at once. The same day is the record date for special dividends from Samsung Electronics and SK hynix
- 09-30 (Wed): Micron earnings, U.S. federal budget deadline (shutdown or not), presidential decision deadline on copper import tariffs (per the prior-week report)
- Around 10-01 (Thu): End of Samsung Electronics' share buyback. Whether a supply-demand vacuum follows
- 10-02 (Fri): U.S. September nonfarm payrolls. Release may be delayed in a shutdown
- Early October: Samsung Electronics Q3 preliminary earnings
Key Things to Watch
- Can Micron's earnings sustain the chip rally above 5% yields?: Semiconductors rose +5.86% this week, widening their stop-loss cushion to 10.28%, and Micron's own cushion is ample at 16.25%. If guidance reconfirms "supply stays tight through 2027 and beyond," the Nasdaq's run of new highs continues; if it falls short, the sector that has single-handedly withstood the rate burden will wobble, removing the prop for the entire index. Note that the Nasdaq volatility index is already elevated at 20.87.
- Will the 10-year settle in the 5.2% range?: The intraweek high was 5.23% and the close 5.18%. A firm break above 5.2% would confirm a third straight week of weakness in utilities, REITs and financials and a stop-loss breach for long-term Treasuries. Conversely, if yields are pushed back by a shutdown or slower hiring, this week's laggard sectors gain room to rebound.
- KOSPI reopening gap and whether won strength persists: With USD/KRW down to 1,354.40 won, the Korea ETF gained +3.24%, but its stop-loss cushion is thin at 4.74%. If the KOSPI prices in the good news accumulated during the holiday with a gap up, the Korea ETF's entry condition will stabilize; if profit-taking emerges alongside the end of share buybacks, the three straight half-size verdicts will again be vindicated.
Risk Factors
- Acceleration of the rate tantrum: With roughly 70% odds of another October hike priced in, continued strength in economic data would open a 10-year 5.5% scenario. The transmission path runs from rising long-term yields → discount-rate pressure on richly valued growth stocks → a valuation correction in the AI megacaps that propped up the index this week. The gap between VIX at 14.87 and VXN at 20.87 signals that the market as a whole has not yet priced in this risk.
- Data blackout from a shutdown: The likelihood of a deal before the Sept. 30 budget deadline is trending lower. A shutdown would delay jobs and inflation releases, forcing the October FOMC to decide without data, and the bond market could price the uncertainty as a term premium, pushing long-term yields higher.
- Renewed Hormuz standoff: WTI came down -7.87%, but Brent held above $100 at $104.32, and the spread between the two grades widened from $3.57 to $11.91. President Trump rejected Iran's proposal to reopen Hormuz, leaving room for diplomatic hopes to unwind. The transmission path runs from a renewed rise in oil → inflation expectations → further rate increases, and the stock market, which benefited this week from rates and oil moving separately, would face both headwinds at once.
- Headwinds from narrowing breadth: This week the gap between the Nasdaq (+2.06%) and the Russell 2000 (-0.80%) was 2.86 percentage points, and the community is comparing the equal-weight index's 5% decline and new lows outnumbering new highs to late 1999. The fewer the stocks leading the advance, the more a single company's earnings, Micron's, sets the direction of the entire index.
This Week's Q&A
- Good economic news came out, yet yields jumped to a 20-year high and small caps fell. With only the Nasdaq near record highs, will this market carry on into next week?
- This week bonds and gold both fell too. What am I supposed to lean on when stocks wobble? Should I just follow the signal to sell long-term Treasuries and gold?
- U.S. oil fell nearly 8% in a week, while international oil actually rose. Why are prices for the same oil moving so differently, and what does it mean for energy ETFs?