He issued an executive order in 2021 to do just that, among many other things to promote competition. There has definitely been an uptick in antitrust cases since then, and inflation has also decreased significantly.

https://www.justice.gov/atr/antitrust-case-filings

lets add taxing the shit out of people who do this to the list.

How would you like the President of the United States to do that? Do you think the President is a dictator that can just unilaterally pass sweeping legislation? How do you think the public would react if the President had the power to directly determine the prices of goods? How do you think that would go in general?

Do you think Biden makes the laws? Did you fail civics class? I said nothing about enacting laws making what these companies are doing illegal, I only said Biden can’t do much about it.

It's within congress's powers for sure. I don't think the president. Congress has done it in the past though, so they for sure can again.

Why is this upvoted?

No, the president of the United States cannot unilaterally implement price controls on goods without the involvement of Congress. Price controls typically involve changes to laws and regulations, which fall under the legislative branch's authority. Congress would need to pass legislation granting such powers or specifically authorizing the president to implement price controls in certain circumstances.

In what country?

Biden can't set tax rates.