Cost the Limit of Price was a maxim coined by Josiah Warren. A buy limit order can only be executed at the limit price or lower, and a sell limit order can only be executed at the limit price or higher. Thus, profit, rent, and interest were considered unjust economic arrangements. Cost is the proper limit of price, which made the following deductions: that the natural wage of labor is its product; that this wage, or product, is the only just source of income.