Keynesian Political Economy

a) What is aggregate demand? Explain why Keynes sees aggregate demand as so important to a productive economic cycle. According to Keynes, how should aggregate demand be managed, and by whom?
b) Explain how corporations can be a solution to the problem that the private wealth of individual capitalists can often be unproductive. Why can individual wealth often be unproductive?
c) What are Keynes’ arguments about ‘wage contracts’ and ‘savings’ that seem to him to justify state intervention in the economy, in order to secure the economic conditions necessary so that the pursuit of private interests doesn’t have perverse effects.