and produces 200 units of output, which it sells at $5 per unit. Firm B buys $100 worth of goods from firm A and $150 worth of goods from firm C, and produces 300 units of output, which it sells at $7 per unit. Firm C buys $50 worth of goods from firm A and nothing from firm B. It produces output worth $1,000. All other products are sold to consumers