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O'd. Graph (a) only. (q) yders pus (0) qdup 4194 5 0 Aquo (q) dup . O Refer to Figure 3-1. The rate of trade-off between producing chairs and producing couches is constant in SHIVHO SHIVHO COUCHES COUCHESDomestic Supply PRICE O World Price Domestic Demand QUANTITY Refer to Figure 9-5. Consumer surplus in this market after trade is O a. C +B. O b. A. O C. B + C+D. O d. A+ B + D