In a monopolistically competitive market, which of the following factors probably does not help to differentiate products? O brand names O loyalty of customers to a particular producer O packaging of the product quality difference O the small number of sellers For each of the following characteristics, indicate whether it describes a perfectly competitive firm, a monopolistically competitive firm, both, or neither. (Note: If the characteristic describes neither, leave the entire row unchecked.) Characteristic Perfectly Competitive Monopolistically Competitive Charges a price that is the same as marginal cost O Sells a product differentiated from those of its competitors O Produces at the efficient scale of the firm O Equates marginal revenue and marginal cost Operates with excess capacity O Earns economic profit in the long run O