According to BIS, the prevalence of zombie firms has ratcheted up since the late 1980s. In its research across 14 advanced economies, the BIS found the share of zombie firms had gone up, on average, from around 2 percent to 12 percent in 2016.
https://www.cnbc.com/2018/10/31/zombie-firms-are-fueling-fears-for-the-global-labor-market.html
