As a result of the decline in available flu vaccines, the equilibrium price should increase, and the equilibrium quantity should decrease.
A decrease in supply will cause the equilibrium price to increase and the equilibrium quantity will decrease. So here, in this situation where there is a decline in available flu vaccines, so here the equilibrium price should increase, and the equilibrium quantity should decrease.
Whereas, an increase in supply, all other things unchanged, will cause the equilibrium price to fall and so the quantity demanded will increase. Thus, the increase in demand causes excess demand to develop at the initial price.
Hence, at equilibrium price, buying plans and selling plans agree and price does not change.
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