Taxes and Subsidies as Instruments of Government Intervention: Their Impact on Prices, Production, and Public Welfare

Taxation and subsidies are central instruments of government intervention that influence market prices, production decisions, resource allocation, and public welfare. This study aims to analyze their effects on market equilibrium, evaluate their economic efficiency and distributional consequences, and identify relevant considerations for sustainable fiscal policy design. A descriptive qualitative approach was employed through a narrative literature review, comparative partial-equilibrium analysis, and hypothetical numerical illustrations. Secondary materials included public economics literature, peer-reviewed studies, and relevant Indonesian policy documents. The baseline illustration showed that a per-unit tax of 2 increased the consumer price from 6 to 7 and reduced equilibrium quantity from 4 to 3, while an equivalent subsidy decreased the consumer price to 5 and increased quantity to 5. Both interventions generated a deadweight loss of 1 in an initially efficient market. Under assumed negative and positive externalities, corrective taxation and subsidies each produced a net welfare improvement of 1. Distributional analysis indicated that fiscal burdens and benefits differ across income groups, while policy sustainability depends on expenditure requirements, administrative feasibility, and institutional acceptance. The study concludes that effective fiscal intervention requires alignment between market conditions, welfare objectives, distributional equity, and fiscal capacity.