As corporations grow globally, and become bigger and bigger, they restrict competition rather than increase it. Their size allows them to effectively control markets.
Telecommunications is one example.
The giants have borrowed so much in their quest for expansion that their debts can only be recovered by charging customers more. Or they will merge with each other, and get the same effect. Size and power inevitably leads to control, whether by companies or governments. Their size allows them to effectively control markets. Telecommunications is one example.