[joz1-k]

What would be an acceptable source for you? Which was the last US mega-corporation that the US government broke up? It certainly wasn't Microsoft or Google. Allowing huge companies to grow even bigger gives them more competitive power in the global market. This wasn't as important before we had super-globalized economies.

[mym1990]

I don't think the question is whether monopolies are being allowed to exist, my question is what is the source as to WHY you think it is happening. A source would be any kind of proof that having a monopoly in one country is a strategic advantage over other countries. Data, publications, etc...

[joz1-k]

> A source would be any kind of proof...

I cannot give you proof for the line of political thinking. :)

> ...having a monopoly in one country is a strategic advantage over other countries.

Having a large, unified domestic market is a strategic advantage because it enables companies to grow to a size that makes them formidable global competitors [0]. The United States and China are examples of this phenomenon. The point isn't whether it's advantageous to allow such companies to become monopolies. Once these companies reach a certain size, politicians are reluctant to break them up because they don't want other global companies to take their place.

[0]: https://companiesmarketcap.com/