Given a demand curve for a drug that reduces the joint pain associated with arthritis, what effect would each of the following circumstances have on the demand or the quantity demanded of this drug? In each case, explain why you have predicted such a change.

An increase in the percentage copayment of insurance coverage, which raises the out-of-pocket price for the drug for the insured client.

A reduction in fees charged by chiropractors, which lowers the out-of-pocket price for chiropractic services, which are a substitute treatment for prescribing medication

An aging of the populationmore elderly people are experiencing joint pain.

A new TV advertisement convinces people that this drug is extremely effective in reducing the joint discomfort associated with arthritis.