Are stocks being stalked by a silent Zombie Apocalypse?

There was some minor buzz on the internet when Jonathan Tepper tweeted the following BIS chart and rhetorically asked if zombie firms was the cause of falling productivity during this expansion. BIS defines a "zombie" firm as a company that has been listed for 10 years or more and has an EBIT interest coverage of less than 1. As the charts show, the number of "zombie" companies have been rising steadily, while advanced economy (AE) productivity and CapEx has been muted during this expansion.

While the zombie hypothesis has much intuitive appeal, especially to the permabear and doomster set, a deeper examination reveals some unanswered questions that casts doubt about this explanation for the muted productivity gains of this cycle.

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