For a price taking firm, which of the following is a straight horizontal line parallel to the x-axis? i. MR ii. AR iii. Price line iv. Demand curve

iv only ii and iii only i, ii, iii i, ii, iii, iv

i, ii, iii, iv

A price taking firm means it is operating in perfectly competitive market. In a perfectly competitive market, all the curves mentioned above are straight horizontal line parallel to the x-axis.