In a typical 10-year period, about one in four families falls below the poverty line in at least one year. What percentage of families are poor for eight or more years?

Any two of these events in questions 1 and 2 occur together? (Draw the diagrams!)

What will be an ideal response?

A ptomaine poisoning scare causes a decrease in the demand for canned tuna fish. Everything else equal, the demand curve for aluminum cans will

a. become steeper. b. become flatter. c. fall. d. rise.