The stock market has been flying high on fumes of Trump optimism. But when will it end? A report from Goldman Sachs Chief US Equity Strategist David Kostin considers negative earnings revisions and wonders when a market reconciliation with reality occurs, what lies ahead for investors? The market exceeding its statistical limits, which has been the case since the US Presidential election, might discover an important force of nature: gravity. “We are approaching the point of maximum optimism,” Kostin wrote in a note that said the S&P 500 will find mean reversion “as investors embrace the reality that tax reform is ... (full story)