AMAZON.COM INC and BEST BUY CO INC moved almost identically (+16.52% vs +17.83%), yet AMZN moved the XLY 149.3× as much. In a cap-weighted index, the bigger company's weight turns the same percentage move into far more points.
Attribution map
slicing the −123.54 pt move · cell size = points contributed · color = direction, intensity = return
AMZN+6.2 pts(+16.5%)
HD−3.2 pts(−22.6%)
GM+1.4 pts
LOW−1.4 pts(−20.6%)
NKE−1.4 pts(−48.7%)
MCD−1.3 pts
TSLA−1.1 pts(−12.8%)
AZO−1.1 pts(−27.0%)
DASH−1.0 pts
ORLY−1.0 pts(−14.2%)
ROST+0.9 pts(+47.2%)
MAR+0.8 pts
ABNB+0.7 pts(+38.2%)
RCL−0.7 pts(−7.2%)
CMG−0.7 pts
HLT
TSCO−0.4 pts
EXPE
GRMN
F
CCL−0.3 pts
APTV−0.3 pts
SBUX
LULU
DHI
NCLH
BKNG
NVR
YUM
DPZ
Concentration curve
cumulative share of the −123.54 pt move · sorted by contribution
When they drove it
cumulative points through the period
Breadth
member returns, this period
−50%−25%0%+25%
From −48.65% (NKE) to +47.68% (GM). Equal-weight, the XLY would be −4.07% vs the actual −52.26%; the gap is what cap weighting did.
By sector
point contribution · sums to −123.54 pts
-47
−4.1
The year, session by session
every trading day of 2026 · hover for the move
JANFEBMARAPRMAYJUNJULAUGSEPOCT
Share this move
pick a view, download it as a 16:9 PNG
Consumer Discretionary · Select Sector
What moved the market
1Y · OCT 9, 2026
−52.26%
−123.5 pts · closed 112.86
19 of 47 rose · 28 fell
AMZN+16.5%
+6.2
GM+47.7%
+1.4
ROST+47.2%
+0.9
MAR+37.4%
+0.8
ABNB+38.2%
+0.7
TSLA−12.8%
−1.1
MCD−18.6%
−1.3
NKE−48.7%
−1.4
LOW−20.6%
−1.4
HD−22.6%
−3.2
Mixed tape · top 3 drove 5% of the declineWMTMT.COM
view 1 of 6
Cycle through the views and download any of them as a 16:9 PNG sized for X. Pasting the page link on X unfurls a server-rendered card on its own.
www.wmtmt.com/xly?p=1y
Share on X copies the image to your clipboard and opens the composer; paste to attach it.
What moved the market, in your inbox
The daily note publishes here after every close; the week's story lands in your inbox on Fridays, free. Read the daily notes.
Babylon Burns
WMTMT is built by the founders of Babylon Burns, a letter on markets, macro, and the systems behind them. The numbers live here; the arguments live there. Subscribing below joins the Babylon Burns letter.