\begin{table}[htbp]\centering\small
\caption{H4 (exploratory) --- Entry into related categories within stores}\label{tab:h4}
\begin{adjustbox}{max width=\textwidth}
\begin{tabular}{lr}\toprule
Statistic & Value \\\midrule
Baseline / outcome windows & 2026-08-31 to 2026-09-27 / 2026-09-28 to 2026-11-01 \\
Stores; (store, category) cells absent at baseline & 1\,540; 20\,530 \\
Entries (cells); entering stores & 149; 93 \\
Mean density, cells with / without entry & 0.412 / 0.282 \\
LPM coefficient on density (store-clustered SE); $t$ & 0.111 (0.050); 2.22 \\
Placebo (category-relabelled proximity, 200 draws): mean, p95, $p$ & -0.004, 0.087, 0.010 \\
Region-level category entries / exits & 11 / 0 \\
Share of entering stores with an `added' burst $>$50\% of baseline catalogue & 0.16 \\
\bottomrule\end{tabular}
\end{adjustbox}
\begin{minipage}{0.95\textwidth}\vspace{2pt}\footnotesize\textit{Notes:} Linear probability model with store and category fixed effects; density = share of a category's proximity mass covered by the store's baseline portfolio (Hidalgo-type proximity from co-occurrence across stores). Exploratory by preregistration: no causal claim.\end{minipage}
\end{table}