For each of the following, indicate if the supply for the good would become more elastic or less elastic as a result of each change and briefly justify your answer. (Once again, in each case the supply curve will also shift, but we are interested in changes in the elasticity.)
a. The supply curve for diamonds if a new process for manufacturing diamonds is created
b. The supply curve for food if pesticides and fertilizers were banned
c. The supply curve for plastic if a very large share of oil output was used to make plastic
d. The supply curve for nurses after several years of increasing wages in nursing