What are the assumptions necessary for the determination of equilibrium income or output in a four sector economy? Discuss. How is the equilibrium level of income and output determined in a four...

What are the assumptions necessary for the determination of equilibrium income or output in a four sector economy? Discuss.

How is the equilibrium level of income and output determined in a four sector model? Explain using both the aggregate demand–aggregate supply and leakages equals injections approach.