Recently, former United States Treasury Secretary Lawrence Summers wrote in the Financial Times that the first challenge faced by Jay Powell as the chairman of the Federal Reserve is to figure out how to achieve a sufficiently robust and financially sustainable economic growth. In fact, there is a very real crisis in Powell's eyes - the U.S. stock market and the U.S. debt are impacting the financial markets, and may even lead to another financial crisis, which will be a great challenge for Powell.