Which of the following is an example of a natural experiment?
A) A research on the effectiveness of a new medicine among some voluntary participants
B) A study on the benefits of regular exercise by paying for the membership fees at fitness clubs for one-half of the participants
C) A laboratory research on the effectiveness of solar power as an alternative source of fuel
D) A research on the effect of air pollution on lung disorders by observing the health conditions of people who stay close to industrial areas and those who stay away from industries
D
You might also like to view...
In defining money according to the transactions approach, you would want to include
A) those assets that are used as a unit of account. B) those assets that are used as a store of value. C) those assets that are used as a medium of exchange. D) those assets that are used as a standard of deferred payment.
An increase in the price of a good would
a. increase the supply of the good. b. increase the amount purchased by buyers. c. give producers an incentive to produce more. d. decrease both the quantity demanded of the good and the quantity supplied of the good.