\begin{table}[htbp]\centering
\caption{Cumulative price change over 11 weeks (13 Aug $\to$ 22 Oct 2026) under alternative unweighted index formulas}\label{tab:indices}
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Sample & Naive mean & Naive median & Chained Jevons & Fixed Jevons & Fixed Dutot & Fixed Carli & Balanced n \\
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Storefront, posted price & 0.004 & 0.000 & 0.003 & 0.001 & -0.001 & 0.027 & 44\,423 \\
Storefront, unit price & -0.012 & -0.007 & 0.003 & 0.001 & -0.004 & 0.036 & 29\,671 \\
All channels, posted price & -0.029 & 0.000 & 0.002 & 0.001 & -0.001 & 0.028 & 45\,214 \\
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No expenditure weights exist: none of these is a consumer price index. Bootstrap (999 listing resamples) 95\% CI for the storefront chained Jevons: [0.002, 0.004]; naive-mean minus Jevons gap: 0.001 [-0.008, 0.008]. Statistics Canada CPI, Quebec, food purchased from stores: Aug$\to$Sep 2026 -0.007 (our chained Jevons, monthly means, +0.001); 12-month CPI change to Sep 2026 +0.016.
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\end{table}