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Shiller, Joseph Stiglitz, Richard Thaler, James Heckman, Thomas Sargent, Angus Deaton, and Oliver Hart; and by central bank officials including Alan Greenspan, Ben Bernanke, Janet Yellen, Agustín Carstens, Vítor Constâncio, and Nout Wellink. The investors Warren Buffett and George Soros have respectively characterized it as a "mirage" and a "bubble"; while the business executive Jack Ma has called it a "bubble".