Which of the following statements is correct?
A)Economists almost always find it easy to conduct experiments in order to test their theories.
B)Economics is not a true science because economists are not usually allowed to conduct experiments to test their theories.
C)Economics is a social science rather than a true science because it cannot employ the scientific method.
D)Economists are usually not able to conduct experiments,so they must rely on natural experiments offered by history.
Instead of conducting laboratory experiments to generate data to test their theories,economists often
A)ask winners of the Nobel Prize in Economics to evaluate their theories.
B)argue that data is impossible to collect in economics.
C)gather data from historical episodes of economic change.
D)assume that data would support their theories.
The most common data for testing economic theories come from
A)carefully controlled and conducted laboratory experiments.
B)computer models of economies.
C)historical episodes of economic change.
D)centrally planned economies.
In conducting their research,economists often substitute historical events and historical episodes for
A)theories and observations.