5. Government macroeconomic intervention

If CPI is falling and unemployment is high, lower interest rates and higher government spending are expansionary choices intended to raise AD, output and employment and move the economy away from deflation. The policy is the action; price stability and low unemployment are the objectives.

The budget position is a flow over the period, not the stock of debt already accumulated. A budget balance compares revenue with expenditure before financing decisions are considered.

If revenue is 500 and total spending is 540, the government must finance a 40 budget shortfall, usually by borrowing or using reserves.

The sign describes the current period’s balance, not the accumulated debt. A deficit may be deliberate fiscal stimulus or the result of weak tax receipts and higher welfare payments during a downturn.

Revenue of 700 and spending of 760 give a deficit of 60. If next year’s revenue is 780 and spending 750, that year has a surplus, but the earlier debt need not disappear.

A deficit of 5 may add about 5 to debt, yet debt-to-GDP can fall if nominal GDP grows faster. Conversely, debt above twice annual GDP indicates substantial borrowing, but affordability still depends on interest, growth and financing terms.

At income $50,000 with total tax$8,000, ART is 16%. If tax rises from $6,000 at$40,000 income to $8,000 at$50,000, MRT is $2,000/$10,000×100=20%. MRT applies to the extra income, not the whole $50,000.

Building a rail line is capital spending: it directly purchases current construction output and may later improve productivity. A pension is a current transfer: it redistributes income and affects AD only when the recipient spends it.

Judge the stance by its effect relative to the existing position, not just by whether the budget is in deficit. Automatic stabilisers can make the balance move without a new discretionary decision.

A tax cut during a recession is expansionary even if the government still reports a deficit. A spending cut that reduces an existing deficit is contractionary, although debt may remain high.

The sizes depend on the AS shape and starting position. With substantial spare capacity, AD expansion can raise output and employment with little price pressure. Near full employment or on a steep/vertical AS section, output responds less and the price level responds more. A small contraction on a highly elastic section may reduce output/employment with little price change.

Some fiscal measures also affect AS. Infrastructure, education or investment incentives can shift LRAS right after a time lag; lower taxes on firms or production subsidies may raise SRAS and/or LRAS. Analyse the demand effect first, then add a supported supply effect.

Higher infrastructure spending shifts AD right immediately through G. Construction raises output and jobs; inflation depends on spare capacity. If the completed infrastructure improves productivity, LRAS later shifts right, allowing higher sustainable output with less price pressure.

The policy decision changes financial conditions first. Households, firms and banks then respond, so the eventual effect on aggregate demand and inflation is indirect and may take time.

Lower rates, more money and easier credit are intended to encourage household consumption and firm investment. The opposite changes restrain borrowing and spending. Central-bank purchases or sales of government securities can be one way to alter liquidity, but the syllabus tool category is the money supply.

If a central bank lowers reserve requirements, banks can support more lending: credit becomes more available and monetary policy is expansionary. Raising lending rates and tightening credit limits is contractionary.

A central bank responding to deflation by cutting rates and increasing the money supply is expansionary. A central bank responding to inflation by raising rates or selling government bonds to reduce liquidity is contractionary.

For example, a rate cut makes borrowing cheaper and saving less rewarding, tending to raise C and I. It may cause capital outflow and currency depreciation, which can raise net exports if trade quantities respond. A rate rise works broadly in reverse and may also reduce import-cost inflation through appreciation.

With spare capacity, expansion can raise output and employment with little inflation. Near full employment, the same AD rise is more inflationary. Contraction is most effective against demand-pull inflation when spending is interest-sensitive; it is weaker against a physical supply shock and may reduce output and employment.

Use a causal test: identify the input or market constraint, explain how the policy improves the quantity, quality, mobility or efficiency of factors of production, and then connect that improvement to greater potential output.

Higher productivity can increase productive capacity because existing resources can produce more. Productive capacity can also rise by increasing the quantity or quality of factors, even when the immediate productivity measure is unchanged. Either successful route can shift LRAS right.

Faster non-inflationary growth, lower structural unemployment, improved competitiveness or reduced cost pressure may follow. They are possible consequences or wider policy benefits; the two syllabus objectives here are productivity and productive capacity.

For any tool, write a complete chain: policy → changed incentive, skill, cost or capacity → productivity/productive capacity → LRAS right. For example, better roads reduce delivery delays and costs, allowing firms to supply more at each price level.

Effectiveness depends on the binding constraint, scale, design, implementation and response of workers or firms. Training and early-years education may have long time lags; subsidies may create fiscal opportunity costs or dependence; deregulation can weaken protection if badly designed.

Road and training expenditure initially enters government spending, so AD may shift right. Better transport and worker skills take time to raise productivity and capacity, shifting LRAS right later. With spare capacity, output and employment can rise with limited inflation; near full employment, the early AD effect may be more inflationary.

Some policies also reduce firms' current unit costs and shift SRAS right—for example, a targeted business subsidy or lower labour cost. Keep this separate from the durable LRAS effect: a temporary cost reduction is not automatically an increase in long-run productive capacity.