In 1981, in San Francisco Solano, Argentina, about 1,800 families took over a piece of wasteland. The government was able to deed 60 percent of this land to some families while the remaining part could not be deeded. The resulting houses varied greatly, based on whether the residents received title. Those who received title also behaved differently, having fewer children, and the children

experienced more education and better health. This is an example of the results from:
a. scarcity.
b. economic growth.
c. economic freedom.
d. private property rights.
e. improved quality of life.

d