Professor Sheena Iyengar from the Columbia Business School is a psycho- economist who specializes in decision making. Her famous âjam studyâ was done using specialty jams in a grocery store. One week, the researchers set up a table in the store showing off six different specialty jams (with snazzy flavors like kiwi-orange, strawberry-lavender...you get the idea). Then they watched how the shoppers behavedâwho stopped to look and, of those who stopped, who actually bought some jam. The first week, with six jams on display, 40 percent of the shoppers stopped to check out the six jams and about a third of them bought oneâabout 13 percent of the shoppers.
A few weeks later, in the same store, with the same time frame, the researchers came back with twenty-four jams. This time, 60 percent of the shoppers in the store stopped byâa 50 percent increase over the six-jam display! But with twenty-four jams on display, only 3 percent of the shoppers bought one.