8. how does the use of plastic to produce bicycle helmets affect other plastic­using industries?

a. it decreases the prices offered by other industries.
b. it increases the demand for products of other industries.
c. it increases the capital available to other industries.
d. it decreases the amount of resources available to other industries.

9. many employees of a local restaurant suddenly quit and seek other opportunities. what is the most likely explanation for the large number of employees quitting?

a. a developing price war
b. a protest action by the union
c. decrease in positive incentives to work
d. decrease of negative incentives to being unemployed