Scale effect, also known as output effect, refers to the process and result that wage rate changes directly affect the production scale or output scale at first, and then further affect the labor demand. If other conditions remain unchanged, but the wage rate is reduced, then the reduction of wage rate means the reduction of enterprise cost, which leads to the reduction of product sales price, and the reduction of product sales price will inevitably make consumers increase their purchase and consumption of such goods. In order to meet the needs of consumers, enterprises need to expand production scale and hire more workers, that is, the demand for labor increases.