Investment will decline if savings also decline when a government's fiscal policy switches from a budget surplus to a budget deficit and the trade deficit stays steady.
A government experiences a budget surplus when its tax revenues exceed its expenditures, a budget deficit when its expenditures exceed its tax revenues, and a balanced budget when the two figures are equal.
A budget deficit causes interest rates to rise, which raises net capital inflows and currency depreciation, which lowers net exports.
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