Competition is the constant agression that keeps your business antifragile Dominating players tend to stifle competition thus become complacent and brittle Monopolies are inherently unstable, unless protected by the law
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I disagree. It'd be like saying "the less effort you make, the more energy you have". It's true on the short term, but in the long run the more you exercise, the better your shape. Hence the unstability. You need competition low enough to profit but high enough to improve.
It depends on who is running the monopolistic company. Some CEOs are content to sit on their dominant position while others take the cash from their successful venture and plow it into new markets and ideas. Ceteris paribus, increased competition means more fragility.