Rational expectation means that when people are anticipating an economic phenomenon, if people are rational, they will make the most of the information obtained to act without making systematic mistakes. According to the above definitions, Which of the following are rational expectations:. ['As soon as the branch of the provincial hospital was put into use, Xiao Chen opened a fruit store nearby.', 'Lao Qin learns that a certain policy is about to be implemented and conducts stock operations based on long-term stock experience.', 'Rumors say that a key middle school branch will be built in Chengnan, and old Liu immediately bought a house nearby.', 'Zhang learned that his college entrance examination score ranked 20th in the province, and he decided to volunteer first to Tsinghua University.']