The government has a new jobs training program. They want to evaluate it using an RCT and ask you to help with the design. They choose 200 US counties and randomly assign 100 counties to receive the program to minimize the risks of spillovers. Under what circumstance would spillovers still be a problem?
A. If some people in the control counties moved to the treatment counties to take the training.
B. If some people in the treatment countries decided not to take the training program
C. If more companies open up in the treatment area
D. If some people in the control areas set up their own training program
Answer: A. If some people in the control counties moved to the treatment counties to take the training.