Originally Posted by
mack_turtle
bike shops are often subject to minimum pricing, so they are contractually obligated not to sell some products below a certain price.
IANAL, but I don't think that that's correct or legal. Shops are often subject to MAP - minimum advertised price - but can sell at whatever price the deem fit. In your tire example, it's not that the shop is obligated to sell above a certain price, it's simply that it's not sensible to sell below their cost unless they have stock that they need/want to liquidate.