Improvement of Different Types of Environmental Regulations on Total Factor Productivity: A Threshold Effect Analysis

Table 1

Input and output variables.

Variable attribute	Measure index	Measure method	Variable unit
Input factor	Labor force factor	Employment in three industries at the end of the year	10,000 persons
	Capital factor	Cumulative investment in fixed assets of the whole society	100 million yuan
	Energy factor	Converted standard coal consumption	10,000 tons
Desirable output	GDP	GDP measured by the expenditure approach	100 million yuan
Undesirable output	Industrial solid waste	Emission of industrial solid waste	10,000 tons
	Industrial waste water	Emission of industrial waste water	10,000 tons
	Industrial waste gas	Emissions of industrial waste gases such as S02 and smoke dust	10,000 tons