[ 9 ] constructed an Optimal Control model and described a negative relationship between education expenditure, S&T expenditure, and air pollution, which showed a decreasing trend from coastal to inland areas.
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Public Expenditure and Green Total Factor Productivity: Evidence from Chinese Prefecture-Level Cities.
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The sentences
Specifically, green total factor productivity at the prefecture-level city level in China showed a trend of oscillating growth, consistent with the results in Chen et al.