6- 5- q = 25,000 4- 3- q = 20,000 2- q = 10,000 q = 5,000 3 4 5 6 The above figure shows the isoquants for producing steel. Increasing returns to scale are O a. present when producing less than 10,000 tons O b. present when producing between 10,000 and 20,000 tons O c. present when producing between 20,000 and 25,000 tons O d. never present O e. always present