Top economist David Rosenberg.Screenshot via Bloomberg TV The US stock market has become a "get-rich-quick" scheme driven by AI mania and the return of "animal spirits", David Rosenberg said. The top economist also doubled down on recession warnings for the US economy, and ruled out hopes of a soft landing. "There is no chance we're having a soft landing in the context of the most pernicious tightening by the Fed since the Paul Volcker years," he said.