Notes from https://www.barrons.com/amp/articles/goldman-sachs-stock-market-lost-decade-9c9fd595

• the cyclically-adjusted price/earnings ratio uses average trailing 10-year inflation-adjusted earnings
• CAPE ratio
• Robert Shiller
  • Nobel Prize-winning economist
  • popularized the CAPE ratio
• technology and communications services now make up about 40% of the S&P 500