Explain how simultaneous shifts in demand and supply curves could explain these situations:
The price of insulin injection kits, used by diabetic patients, increases from $45 to $52, but the equilibrium quantity remains the same.
A pest attack on the tomato crop increases the cost of producing ketchup. A mild winter causes cattle herds to be unusually large, causing the price of hamburgers to fall. The equilibrium quantity of ketchup is unchanged.
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