What is a budget deficit?

Question

BlackTom AI · Accepted Answer

A budget deficit occurs when a government's spending exceeds its income over a particular period of time.

1) Relevant knowledge points and concepts
- Government budget balance: the difference between government revenue (mainly taxes, T) and government spending (G).
- Deficit vs surplus vs debt: a deficit is a flow over a period (annual shortfall); a surplus is the opposite (revenue > spending); public debt is the accumulated stock of past deficits minus any surpluses.

2) Step‑by‑step reasoning
- Define the budget balance B = T − G.
- If B < 0 then the government is running a deficit because expenditures exceed revenues.
- The magnitude of the deficit = G − T (a positive number when spending is larger).

3) Calculation example (intermediate steps shown)
- Suppose G = $500 billion and T = $420 billion.
- Budget balance B = T − G = 420 − 500 = −80 (billion).
- Deficit magnitude = G − T = 500 − 420 = 80 (billion).
- This shows spending exceeds income by $80 billion in that period.

4) Why the correct answer is correct
- Option (a) precisely states the situation: “The amount by which a government's spending exceeds its income over a particular period of time.” That matches the algebraic condition B < 0 and the computed magnitude G − T.

5) Why the other options are incorrect
- (b) describes a surplus (income exceeds spending), the opposite of a deficit.
- (c) refers to public (government) debt, which is the cumulative total owed, not the flow in a period.
- (d) repeats the description of a surplus (taxation revenue greater than government spending), so it is incorrect for “deficit.”

6) Conclusion
- Therefore the correct choice is (a): the amount by which a government's spending exceeds its income over a particular period of time, which matches the provided answer.

What is a budget deficit?单项选择题

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