To reduce frequent heavy air pollution, the Chinese government suspends clinker production during the heating season in most areas of the North, which is known as the Clinker Off-peak Production Policy. The questions regarding such a repressive production policy for environmental purposes are whether this policy is effective in reducing pollutants and whether the marginal cost is high. To explore these policy effects, a quasi-experiment is designed, taking advantage of spatial-temporal variations in policy implementation. With the triple-difference method and environmental satellite data, the effect on air pollution is estimated to be −1900 μg/m2 (~2%) of SO2 and −3200 μg/m2 (~10%) of NO2. With daily price information and the difference-in-differences method, the market effect is estimated to be an approximately 10% increase in annual sale prices. The marginal cost estimated through a back-of-the-envelope analysis is 32 k RMB yuan/ton SO2 or NO2, which is 24.88 times the pollutant discharge fee but which better reflects the pollutant shadow price.
“Taking photos to make money” APP is a kind of self-service mode under the mobile Internet mode, so it is of practical significance to study the task pricing for the later improvement of service. Based on this, this paper firstly determines the main indexes and calculation methods that may affect task pricing, then uses the one-way analysis of variance to determine the significant differences caused by each index variable on task pricing, and then uses multiple regression analysis to consider the influence of multiple factors on task pricing. As a result, the index variable should be removed. Then the relationship between the other three indicator variables and task pricing is analyzed. And then you get the equation. Finally, the unfinished data in the original data were selected, and the influence of index variables on task pricing was observed by using multiple regression analysis. The reasons for unfinished tasks are analyzed mainly because the shortest distance between members and tasks is not considered.
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