Looking at your competitors' or suppliers' prices to set your prices is not illegal. Looking at the same inputs that your competitors' are using in order to se

Looking at your competitors' or suppliers' prices to set your prices is not illegal. Looking at the same inputs that your competitors' are using in order to set your prices is not illegal. Purchasing metrics based on those inputs and using those to set your prices is probably not illegal, depending on what goes into those metrics. Coordinating with your competitors to set your prices is illegal. The line between that is not necessarily a super bright line, but some cases are extremely obvious. One key test: if you undercut your competitors' prices, will you get punished for defecting, other than your competitors potentially lowering their prices in response? If so, you or your competitors or both are probably doing something illegal.