A) I'm flexible on the exact numbers here, but a starting point for discussion could be a company with more than 20% market share in a total market above 1% GDP. I admit that finding an effective standard that can withstand legal scrutiny is the hard part here, and we should work on improving it once we agree that megacorporations should be destroyed. I am still looking for a good way to cover vertical integration and other multi-market failure cases, for example.

B)

- Small business should be the driving force in the economy. They are the wellspring of competition and the bastion of the middle class.

- Megacorporations seek to destroy the ability for small businesses to compete with them, leaving buyout or vassalage as their only possible endgame. This shuts down true competitive threats to the megacorporations' dominance. They are trying to pull up the ladder behind them.

- A company should not be so large it can afford to ignore its customers.

- A company should not be so large that it can treat regulatory fines as merely a cost of doing business.

- A company should not be so large that it gets to write the laws and regulations.

- The Monopoly standard is not strict enough. Cartel-like oligopolies cooperate on the important political issues while maintaining a facade of competition.

- Our political systems are not equipped to handle the centralization of such large amounts of wealth. While the economy may not be a zero-sum game, power is, and power follows money.

- ADDED: A company must not be too big to fail.

- ANOTHER: A company should not be so large it can use loss-leaders to bully its way into other markets.