The methods a society uses to produce, distribute and consume goods and services is its
a. scarcity.
b. demand.
c. opportunity cost.
d. economic system.

"we do not ride on the railroad; it rides upon us," thoreau writes (par. 2). name an "improvement" in contemporary life that is supposed to represent progress but that you think has had a negative impact overall. describe its impact. has it had any benefits?