\begin{table}[htbp]\centering\footnotesize
\caption{Regional sample: stores, listings, certification and assortment diversity}\label{tab:region_summary}
\begin{adjustbox}{max width=\textwidth}
\begin{tabular}{lrrrrrr}\toprule
Region & Stores & Listings & Median catalogue & Certified share & $\tilde H$ (M) & $\tilde H$ rarefied (15 stores) [2.5; 97.5] \\\midrule
Montréal & 237 & 61\,419 & 65 & 0.59 & 0.834 & 0.780 [0.682; 0.859] \\
Inconnue & 226 & 71\,692 & 77 & 0.07 & -- & -- \\
Montérégie & 177 & 57\,699 & 34 & 0.60 & 0.860 & 0.791 [0.699; 0.866] \\
Estrie & 165 & 16\,447 & 20 & 0.46 & 0.812 & 0.741 [0.640; 0.827] \\
Capitale-Nationale & 126 & 35\,555 & 26 & 0.42 & 0.854 & 0.786 [0.674; 0.869] \\
Chaudière-Appalaches & 102 & 11\,398 & 22 & 0.76 & 0.835 & 0.767 [0.664; 0.849] \\
Laurentides & 99 & 20\,004 & 35 & 0.59 & 0.885 & 0.822 [0.743; 0.888] \\
Saguenay--Lac-Saint-Jean & 97 & 15\,845 & 34 & 0.34 & 0.846 & 0.790 [0.696; 0.862] \\
Lanaudière & 66 & 8\,828 & 34 & 0.56 & 0.831 & 0.775 [0.688; 0.845] \\
Centre-du-Québec & 61 & 9\,356 & 19 & 0.41 & 0.824 & 0.767 [0.670; 0.848] \\
Bas-Saint-Laurent & 39 & 5\,750 & 34 & 0.49 & 0.814 & 0.774 [0.691; 0.842] \\
Outaouais & 36 & 33\,429 & 26 & 0.47 & 0.839 & 0.798 [0.725; 0.861] \\
Mauricie & 31 & 2\,521 & 27 & 0.42 & 0.770 & 0.741 [0.679; 0.796] \\
Gaspésie--Îles-de-la-Madeleine & 30 & 7\,514 & 28 & 0.30 & 0.837 & 0.799 [0.733; 0.863] \\
Laval & 25 & 6\,528 & 33 & 0.84 & 0.805 & 0.785 [0.723; 0.838] \\
Abitibi-Témiscamingue & 21 & 5\,206 & 36 & 0.38 & 0.870 & 0.845 [0.808; 0.879] \\
Côte-Nord & 16 & 587 & 18 & 0.38 & 0.791 & 0.788 [0.762; 0.802] \\
Nord-du-Québec & 3 & 276 & 27 & 0.00 & 0.655 & -- \\
\bottomrule\end{tabular}
\end{adjustbox}
\begin{minipage}{0.95\textwidth}\vspace{2pt}\footnotesize\textit{Notes:} Assortment sample. $\tilde H$ = normalised Shannon entropy of category shares (20 categories); M = merchant-equal weights. Rarefied entropy = mean over 2\,000 draws of 15 stores without replacement; brackets give the 2.5th and 97.5th percentiles of the draws. `Inconnue' = stores whose location could not be established (excluded from regional inference).\end{minipage}
\end{table}