alt Hacker NewsI heard that one company buying all the product or a majority of the product is called a monopoly practice.
If a dominant buyer locks up most of the supply chain through exclusive contracts, it prevents rival companies from getting the materials they need to survive, which violates laws like Section 2 of the Sherman Antitrust Act.
It's called a monopsony[1], regardless, antitrust regulation is famously dead under the current US administration.
[1] https://en.wikipedia.org/wiki/Monopsony