I have a proposal to facilitate the breakup of monopolies that won't require waiting forever for the enforcement agencies to act. We need an industry concentration tax similar to the windfall profits tax. Charge a supplemental tax rate that applies to any company with industry concentrations above certain thresholds.

When investors realize that funding consolidation will not produce increased after-tax profits, these monopoly-building acquisitions will cease, and those companies already over threshold will find ways to break themselves up as quickly as possible.

It would be like the old conglomerates of the 1950s and 1960s that found that large size actually diminishes investor returns, unless monopoly profits are available. Since we used to have anti-trust enforcement back in the day, those conglomerates discovered the disadvantage of size and were not able to obtain the profits of monopoly.