It is the process of enabling people to increase control and to improve their health.

Which of the following pairs is most similar to each other? a. barter goods and fiat money b. digital money and barter goods c. fiat money and digital money d. commodity money and digital money

Aprimary advantage of organizing economic activity within firms is thea. ability to coordinate highly complex tasks to allow for specialized division of labor. b. low administrative costs because of reduced bureaucracy. c. eradication of the principal-agent problem. d. high-powered incentive to work as salaried employees for an existing firm.

Russell's study compared gpa of those students who volunteered for academic study skills training and those who did not elect to take the training. he found that those who had the training also had higher gpa. with which validity threat should russell be most concerned?