The table below shows potential macroeconomic events causing shifts in the aggregate demand (ADADAD), short-run aggregate supply (SRASSRASSRAS), and long-run aggregate supply (LRASLRASLRAS) curves for an open economy.
| AD AD\,AD shifts to the left | SRAS SRAS\,SRAS shifts to the right | LRAS LRAS\,LRAS shifts to the right | |
|---|---|---|---|
| A | The government increases its spending on infrastructure | Global commodity prices fall | The state pension age is lowered |
| B | The domestic exchange rate appreciates | Employers' National Insurance contributions are reduced | Government spending on vocational training increases |
| C | The central bank lowers the base interest rate | The corporate income tax rate is increased | Net migration of working-age adults becomes negative |
| D | Consumer confidence index rises significantly | Business energy subsidies are abolished | Business investment in new capital machinery increases |
All other things being equal, which combination, A, B, C or D, is correct?
Option A
Option B
Option C
Option D