A decrease in government spending affects the aggregate expenditure line by "shifting the aggregate expenditure line downward."
This is because the aggregate expenditures are household consumption, business spending through investments, and government spending on goods and services.
Therefore, when government spending decreases, the total or aggregate expenditure reduces, thereby shifting the "the aggregate expenditure line downward."
Hence, in this case, it is concluded that government expenditure forms a vital part of the aggregate expenditure of a country.
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