Why is article i, section 8 of the constitution known as the elastic clause?

Which statement best explains how the invention of corporations contributed to the economy in the 1800's

In a low-income household in the developed world, more than 30% of a woman's income typically goes toward a. transportation costs b. child care c. clothing and incidentals d. the repayment of educational loans

Indicate the point where a monopoly will set its price