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Input‒output variable selection and symbols.
| Level-I indicators | Level-Ⅱ indicators | Level-Ⅲ indicators | Symbol |
|---|---|---|---|
| Input | Capital stock | Fixed assets investment | K |
| Labor force | Employed persons | L | |
| Energy input | Electricity consumption | E | |
| Desirable output | Economic output | Provincial real gross domestic product (GDP) | Y |
| Undesirable output | Environmental pollution | Industrial wastewater emissions | C |
| Industrial sulfur dioxide (SO2) emissions | |||
| Industrial dust emissions |
