Practise Edexcel A A Level Economics 2.4 National income with exam-style questions for A Level Economics. 75 questions covering 2.4.1 National income, 2.4.2 Injections and withdrawals, 2.4.3 Equilibrium levels of real national output, and 2.4.4 The multiplier, matched to the Edexcel A A Level Economics (9EC0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.