Zhang Qiang: when the economy of a region is depressed, many people lose their jobs, so they reduce the cost of living, resulting in more people losing their jobs and leading to the deterioration of the economy. The economy was deteriorating and prices finally hit rock bottom. Low prices stimulate people to increase the consumption of life, and the increase in consumption leads to the improvement of the economic situation. Li Ming: if people lose their jobs, they will not be able to increase their consumption and have no money to buy goods other than the necessities of life. 
if prices hit rock bottom, it will not lead to an improvement in the economic situation.
After the economic situation improves, the company will hire more people and many of the re-employed will buy goods that were previously postponed.