A researcher wanted to know whether people in his community like Coca-Cola or Pepsi. He found some people who like Coca-Cola and asked them to point out their preferences through tasting in a glass of Coca-Cola and a glass of Pepsi. The cups are not labeled to avoid trademarks. It caused obvious prejudice
Most of the participants are aware of the market share of Coca-Cola and Pepsi, and research has shown that they generally have a sympathy for the one with less share
it was marked as 1 on Pepsi, and the Coca-Cola cup was marked as 2. The results showed that more than half of people prefer Pepsi to Coca-Cola.