This question has 4 unrelated parts.Show your calculations!

a)You are a managerial decision-maker studying the market for Vaccine X.Assume that there is a major technological advance in vaccine production techniques, and vaccine output increases greatly.

• In the market for Vaccine X, discuss whether you would see a change in D, S, Qd or Qs, and also the direction of the change (increase or decrease).
• What would you expect would happen to the equilibrium price and the equilibrium quantity of Vaccine X?

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b)You are a managerial decision-maker studying the market for Product A, which has a cross price elasticity of demand of -1.5 with product B.Suppose there is a decrease in the current market price of Product B.

• In the market for Product A, discuss whether you would see a change in D, S, Qd or Qs, and also the direction of the change (increase or decrease).
• What would you expect would happen to the current equilibrium price and the current equilibrium quantity of Product A?

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c)You are a managerial decision-maker studying the market for Product Z.You find that the price elasticity of demand for Product Z is 0.35 (in absolute value).If the price of Product Z rises by 75 percent, calculate the percentage change in the quantity demanded of Product Z.

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d)You are studying competition levels in an industry.There are five firms in the industry.For the largest four firms, you have been able to find their respective sales as $900,000, $650,000, $375,000, and $205,000.Given that the C₄ratio is 95 percent, calculate the HHI for this entire industry.