Goods X, Y and Z each have downward-sloping demand curves and upward-sloping supply curves. Good X is in joint supply with good Y and in joint demand with good Z. Demand for good X increases. What changes will occur in the prices and sales of goods Y and Z?
- Agood Y: price fall, sales fall; good Z: price rise, sales rise
- Bgood Y: price fall, sales rise; good Z: price rise, sales rise
- Cgood Y: price rise, sales fall; good Z: price fall, sales rise
- Dgood Y: price rise, sales rise; good Z: price fall, sales fall