Which of the following is true of productivity?
a. the most effective way to continually increase productivity is to work harder. b. more productive workers tend to earn higher incomes.
c. an increase in human capital can increase productivity.
d. productivity is measured as the ratio of output per worker per unit of time.
e. b, c, and d are all correct.

answer; /// i believe that the correct answer is (d)the huang he river valley;

ur mom

explanation:

“the iliad” (gr: “iliás”) is an epic poem by the ancient greek poet homer, which recounts some of the significant events of the final weeks of the trojan war and the greek siege of the city of troy (which was also known as ilion, ilios or ilium in ancient times).