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Stocks are still flying high. But doubts are creeping in about the S&P 500’s run, as some analysts have flashbacks to valuations during the dotcom boom.

By Andrew Ross SorkinBernhard WarnerSarah KesslerMichael J. de la MercedDanielle Kaye and Vivienne Walt

Andrew here. As the world focuses on Monday’s meeting at the White House with President Volodymyr Zelensky of Ukraine and other European leaders, Wall Street is turning its attention to Jackson Hole, Wyo., where central bank officials are headed this week and where Jay Powell of the Fed is expected to speak. Investors will try to read between the lines of whatever he says, with September’s rates meeting potentially being his last major decision before President Trump names Powell’s successor, effectively creating a shadow Fed chair.