Anti-competitive behavior and collusion is where they into trouble. If Amazon executives sits down with Walmart execs and said here is a list of minimum prices

Anti-competitive behavior and collusion is where they into trouble. If Amazon executives sits down with Walmart execs and said here is a list of minimum prices for these products we will both adhere to, that is illegal. What Amazon is doing instead is automating price increases and see if Walmart will also automatically raise their price too. If yes, then keep that price. If no, then lower the price. Because it is automated and happens so fast, it has a similar effect as handing a list to Walmart.