Richard is a researcher in a pharmaceutical company. His company develops a new drug to treat chronic joint pain in humans. He wants to check the effect of this drug on a group of elderly people. He divides the group into an experimental group and a control group. He gives the new drug to the experimental group, while he gives a non effective look-alike drug to the control group. Both groups give the same result. Identify the effect felt by the control group, despite not taking the drug.