Why Do Mergers Come In Waves?

Companies have a marked tendency to all try to join together with other companies at the same time. In the late 1990s, the giddy heights of the dot com era were fed by merger mania. In the first few years of the the twenty-first century, however, mergers were decidedly out of style. Now that the private equity giants are on the prowl, aggressive combinations of otherwise staid companies are again the order of the day.

Any individual merger can probably be explained in terms of a fairly simplistic rationale, at least if the management of either firm involved did even the merest due diligence. Yet market forces seem unlikely to explain why a series of otherwise unconnected companies in various industries would all try to merge at the same time.

One facile explanation is that group psychology momentarily grips a number of powerful yet otherwise unimaginative souls who try to ride every bull market to personal riches. Just like most prospectors show up after the gold is gone, group psychology can explain why one isolated success could spark a trend that others try to carry forward. Yet this explanation fails at least one key test: the wave of mergers snowballs so quickly that no one knows whether or not the merger will be a success or not before they decide to copy it. This might indicate that followers are irrational as well as unimaginative, but this explanation seems overly pessimistic. More likely, the originators of all those mergers must believe they see some underlying trend that gives mergers a greater chance of success.

The trouble with providing explanations for mergers is that post hoc explanations are worthless for predicting the next trend. Many of the arguments in favor of mergers, such as vertical integration, tax benefits, greater efficiencies, and the like, have been well and widely known for years. The tax benefits of greater debt loads have been standard undergraduate economics fare for decades - and that completely ignores a legion of MBAs who are trained to identify just this sort of low-hanging fruit.

Current merger-mania seems to be driven by a wide availability of cheap capital. Excess liquidity chasing too few assets are driving up prices worldwide and mergers provide a sure way to utilize that cheap money. Yet the wave of cheap money significantly pre-dated the current merger mania, and individual companies are likely just as capable of accessing modern capital markets as are conglomerates.

To the extent that psychology is responsible for merger mania, there may be no one explanation of the phenomenon. Still, the hidden mechanism that determines the beginning of merger mad frenzies would be a rich prize indeed.