Assume that the multiplier has a value of 3. Now assume
that the government decides to increase aggregate
demand in an attempt to reduce unemployment. It raises
government expenditure by £100 million with no increase
in taxes. Firms, anticipating a rise in their sales, increase
investment by £200 million, of which £50 million consists
of purchases of foreign machinery. By how much will GDP
rise? (Assume that nothing else changes.)