Figure 7
The line graph displays two lines: the iso-expenditure line in red and the iso-comprehensive-benefit line in green. The x-axis represents the price subsidy coefficient (m) ranging from 0.1 to 0.9, and the y-axis represents the green subsidy coefficient (τ) ranging from 0.6 to 2.1. The graph is divided into four regions labeled I, II, III, and IV, each with different relationships between the subsidies and benefits. The red line indicates where the expenditure for both subsidies is equal, while the green line indicates where the comprehensive benefits are equal. The graph shows how these lines intersect and divide the space into regions with different subsidy and benefit dynamics.Policy-space comparison between the price-subsidy and green-subsidy policies based on subsidy expenditure and comprehensive benefit