As the interest rate on mortgage loans has been reduced and the pressure on people to repay their loans has been reduced, an agency predicts that the sales of commercial housing in a certain place will increase, but in fact, the sales have not increased significantly. Which of the following, if true, best explains the above phenomenon? ['There has always been a phenomenon of population outflow.', 'Local commercial housing prices have not fallen significantly.', 'Some developers canceled the preferential policies for buying a house.', 'Per capita income declines due to the poor economic environment.']