Sablik, Timothy. "At the Richmond Fed : Concentrating on Market Concentration," in Federal Reserve Bank of Richmond. "First Quarter 2019, Volume 24, Number 1," Econ Focus (Federal Reserve Bank of Richmond) (First Quarter 2019) : 11-11. https://fraser.stlouisfed.org/title/3941/item/583834/toc/527903 , accessed on February 1, 2023.