sp500.csv: S&P 500 index, daily close (FRED series SP500, S&P Dow Jones Indices LLC), 26 Sep 2016 – 25 Sep 2026, downloaded 27 Sep 2026 from https://fred.stlouisfed.org/series/SP500. brent.csv: Crude Oil Prices, Brent, Europe, daily (FRED series DCOILBRENTEU, U.S. Energy Information Administration), 26 Sep 2016 – 22 Sep 2026, downloaded 27 Sep 2026 from https://fred.stlouisfed.org/series/DCOILBRENTEU.