Meaning of maximum retail price

You don't indicate what territory you are asking this for but generally... To encourage competition and protect consumers, many countries will have laws to prevent collusion between manufacturers of retailers of goods and services. If such laws did not exist, different players could agree to charge more for a product than is justified and consumers would be forced to pay or go without. In practice, this means that a manufacturer or distributor may not tell the retailer that he must sell a given product at a specific price. In many areas, however, the legislation does allow the manufacturers to recommend a price, frequently marked as MSL or Manufacturers Suggested List price on the package. It is then difficult for a retailer to sell the product for a higher price than the MSL or, if he does, consumers will understand that the high price is due to the retailer's "greed" and no blame should be attributed to the manufacturer. In some areas, the manufacturer may be able to actually set the maximum sale price, but not be able to set a minimum price.