This is more intuitive than quantitative, but my gut feeling is that the economy just stumbled off a cliff. Neither the cliff edge nor the fatal misstep are visible yet; both remain in the shadows of the intangible foundation of the economy: trust, animal spirits, faith in authorities' management, etc.

Since credit expansion is the lifeblood of the global economy, let's look at credit expansion. Courtesy of Market Daily Briefing, here is a chart of total credit in the U.S. and a chart of the percentage increase of credit.

Notice the difference between credit expansion in 1990 - 2008 and the expansion of 2009 - 2017. Credit expanded by a monumental $40+ trillion in 1990 - 2008 without any monetary easing (QE) or zero-interest rate policy (ZIRP). The expansion of 2009 - 2017 required 8 long years of massive monetary/fiscal stimulus and ZIRP.