In an open economy, firms increase their planned investment spending by £45bn at the same time as the government cuts its capital expenditure by £15bn. As a result of these concurrent changes, national income rises by £54bn. Assuming no other changes to autonomous injections or leakages, the size of the multiplier is:
0.900.900.90
1.801.801.80
1.201.201.20
0.560.560.56