A macroeconometric simulation study is undertaken to evaluate the impacts of a price subsidy for tree crops in Papua New Guinea (PNG). The price subsidy had favourable impacts on tree crop export income, aggregate demand, private consumption, and investment and employment. It increased imports, the budget deficit, and the demand for money and adversely affected the fiscal balance, inflation and interest rates, the BOP position and macroeconomic stability. The price subsidy contributed favourably to internal balance but adversely affected external balance. It worked against many of the policy objectives and made macroeconomic management difficult. With the introduction of the price subsidy, the government violated the commitments made under the Uruguay Round Agreement on Agriculture and PNG’s Structural Adjustment Program.