There are three firms in an economy: A, B, and C. Firm A buys $450 worth of goods from firm B and $260 worth of goods from firm C, and produces 260 units of output, which it sells at $3 per unit. Firm B buys $110 worth of goods from firm A and nothing from firm C, and produces 310 units of output, which it sells at $3 per unit. Firm C buys $125 worth of goods from firm A and $75 worth of goods from firm B. It produces output worth $1,050. All other products are sold to consumers.