WHAT is the best way to kill a zombie? Fans of Daryl Dixon, a character in “The Walking Dead”, a television series, will know the answer: a crossbow bolt to the brain. Getting rid of corporate zombies, however, is a much more complicated process.

Ageing populations mean that the workforces in developed economies are likely to stagnate, or even shrink, in coming decades. That means almost all the burden of economic growth is likely to fall on productivity improvements. There has been a lot of focus on labour-market flexibility as the key to solving this problem, but the flexibility of the corporate sector may be just as important. Indeed, there is a growing belief that the persistence of zombie firms—companies that keep operating despite a poor financial performance—may explain the weak productivity performance of developed economies in recent years.

An inability to kill off failing companies seems to have two main effects. First, the existence of the...Continue reading