Determine whether and how each of the following factors would shift the demand curve for chiropractic visits:
1. An increase in the out-of-pocket price of chiropractic visits
2. An increase in back problems
3. A reduction in the out-of-pocket price for chiropractic visits
4. An aging of the population
5. An increase in the out-of-pocket price of back surgery ( a substitute for chiropractic services)
6. A reduction in the price of radiographs ( a complement of chiropractic services )
7. An advertising campaign that makes people more aware of the benefits of chiropractic care