S = -200 + 0.25Y

1. At equilibrium planned savings are equal to planned investment. Equilibrium level of income is 2,000. Substituting the value of Y in the savings function, we get;

S = -200 + 0.25 × 2,000

S = 300; I = 3300

Thus, investment expenditure at equilibrium level of income is 300.

2. Consumption + Savings = Income,

Autonomous consumption means the level of consumption expenditure when income is zero.

When Y = 0, Savings = -200

So, autonomous consumption = 200