If marginal cost is zero a firm can still profit through pricing

Which of the following help explain the increase in the U.S. labor force participation rate for women?

i. There was a significant fall in the number of children women were choosing to have. ii. There was an increase in the educational level of women. iii. Technological change in the home increased the time available for work outside the home. A) i only B) ii only C) i and ii D) ii and iii E) i, ii, and iii

For the period 1947-2012, employment in the United States was

A) procyclical and leading. B) procyclical and lagging. C) countercyclical and leading. D) countercyclical and lagging.