When output is below potential (recession), lower tax revenues and higher transfer spending create a cyclical deficit, even with no change in discretionary policy. When output is above potential (boom), higher tax revenues and lower transfers create a cyclical surplus.
Exam tip: If asked whether a deficit is caused by discretionary policy or automatic stabilizers, always check the budget balance at potential output. A deficit that disappears when output returns to potential is entirely cyclical.
4. 时滞与对乘数波动的影响★★★★☆⏱ 3 min
A key advantage of automatic stabilizers over discretionary fiscal policy is that they eliminate the three main lags that hinder discretionary policy: recognition lag (time to identify an output gap), legislative lag (time to pass new policy), and implementation lag (time for policy to affect the economy). Since automatic stabilizers are permanent pre-existing policies, they respond to output changes within the same quarter.
Another key relationship tested on the AP exam is the effect of automatic stabilizers on the expenditure multiplier. Automatic stabilizers reduce the size of the multiplier, because any initial change in autonomous spending increases tax revenues and reduces transfers, which withdraws some income from the circular flow, offsetting part of the initial change in disposable income. This reduction in the multiplier reduces business cycle volatility.
Exam tip: If asked how automatic stabilizers affect output volatility, remember that smaller multipliers mean less volatile output, which is the intended stabilizing effect.
5. AP-Style Concept Check★★★☆☆⏱ 2 min
Common Pitfalls
Why: Students confuse actual deficit with structural deficit, forgetting that automatic stabilizers automatically increase deficits in recessions even without any policy change.
Why: Students only remember the recession case, and forget that automatic stabilizers work symmetrically in both directions.
Why: Students mix up the three multipliers because they look similar but have different values.
Why: Students confuse automatic stabilizers with discretionary fiscal policy because both are types of fiscal policy.
Why: Students reverse the relationship between automatic stabilizers and multiplier size because 'bigger multiplier = more output change' seems intuitive at first glance.