The Sherman Anti-Trust Law.
I believe you're looking for antitrust laws
Price fixing (it is illegal).
Price fixing is when companies that have the same products in common come together to agree to a set price. Price fixing is fair and is in the best interest of being socially responsible by protecting the market from becoming a monopoly.
price fixing
To maximise profits.
To prevent price instability and fluctuations so that companies don't lose money.
An agreement between different companies to charge the same amount for a product or service is known as "price-fixing" whereby rival companies agree not to sell goods below a certain price.
When companies agree to set prices artificially high.
Price Fixng or Cartel.
This is called price-fixing, which is illegal as it reduces competition and can harm consumers by limiting choices and potentially leading to inflated prices.
So that they could all make more money.
An agreement by different companies to charge the same price for products, rather than letting the market adjust normally based on supply and demand.