1\begin{table}[htbp]\centering\small2\caption{H4 (exploratory) --- Entry into related categories within stores}\label{tab:h4}3\begin{adjustbox}{max width=\textwidth}4\begin{tabular}{lr}\toprule5Statistic & Value \\\midrule6Baseline / outcome windows & 2026-08-31 to 2026-09-27 / 2026-09-28 to 2026-11-01 \\7Stores; (store, category) cells absent at baseline & 1\,554; 22\,263 \\8Entries (cells); entering stores & 151; 98 \\9Mean density, cells with / without entry & 0.355 / 0.262 \\10LPM coefficient on density (store-clustered SE); $t$ & 0.102 (0.031); 3.25 \\11Placebo (category-relabelled proximity, 200 draws): mean, p95, $p$ & -0.005, 0.051, 0.005 \\12Region-level category entries / exits & 1 / 0 \\13Share of entering stores with an `added' burst $>$50\% of baseline catalogue & 0.19 \\14\bottomrule\end{tabular}15\end{adjustbox}16\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}17\end{table}18