1 For the following questions, select the key term that best matches with the definition provided. - A horizontal summation of individual supply curves for a product - A condition in which the economic outcome cannot be improved upon - The amount by which a firm's total revenue exceeds its total (explicit plus implicit) costs; also referred to as economic profit - A time period where one or more of the factors of production are fixed - The amount of a good or service a producer is willing to offer for sale at different prices, holding everything else constant A. Market supply curve B. Supply curve C. Optimum D. Pure profit E. Short run