Updates week 13 slides (#32)

Author: jdingel

slides/week13/slides.pdf

@@ -417,6 +417,18 @@
 \end{center}
 \end{frame}
 % -----------------------------------------
+\begin{frame}{Smith, Ocampo (2025): ``The Evolution of US Retail Concentration''}
+\begin{itemize}{\small
+\item Construct sales by 18 product categories for individual retail stores using 1992--2012 Census of Retail Trade to measure concentration of local product markets
+\item General merchandisers account for more than 20\% of sales in electronics and appliances, groceries, and clothing
+\item National and local HHI increased almost in parallel between 1992 and 2012
+\item Expansion of large retailers across markets accounting for 89\% of the increase in national retail concentration between 1992 and 2012
+\item Online and other nonstore retailers have a small effect because they account for less than 10\% of CRT sales 
+\item Retail is the only sector with consistently increasing local concentration
+\item Consumers are simultaneously purchasing a wider variety of brands as they buy those products from a smaller set of retail firms (retail firms may gain market power with consumers and negotiating power with suppliers)
+}\end{itemize}
+\end{frame}
+% -----------------------------------------
 \begin{frame}{Back to the Cheesecake Factory}
 \begin{itemize}
 \item Employment grew from 14,200 in 2003 to 38,100 in 2018