美股获得了诸多因素的顺风助力，再创新高似乎指日可待。但一旦股市录得巨大涨幅，问题就变成了：这波涨势还能走多远？
Stock Rally Collides With a New Slate of Worries
The S&P 500 and Nasdaq composite fell in every session this week
Will AI lower interest rates?
Kevin Warsh, the Fed’s new chairman, believes artificial intelligence will boost productivity and justify lower interest rates, echoing Alan Greenspan’s 1990s approach. | Finance & economics