Summarize what we earned in chapter 3 e We defined demand as the sum of consumption, investment, and government spending. We assumed that consumption was a function of disposable income (income minus taxes), and took investment spending government spending, and taxes as given The equilibrium condition was given by Y=C(Y-D+l+GSummarize what we learned in chapter 3 We defined demand as the sum of consumption,investment,and government spending. We assumed that consumption was a function of disposable income(income minus taxes), and took investment spending, government spending, and taxes as given. The equilibrium condition was given by Y=c(Y-T)+I+G