Investment Fall Reduces Aggregate Demand Steps:

• Investment spending is a component of aggregate demand (AD = C + I + G + NX).
• A fall in investment decreases AD.
• Lower AD shifts the AD curve left, reducing real GDP.
• Reduced GDP leads to lower production and fewer jobs needed.

Why none are correct:

• A fall in investment decreases, not increases, economic growth via lower AD and GDP. Why D is incorrect (as stated):
• Employment decreases due to reduced business output and hiring, per Okun's law linking GDP drops to unemployment rises.
• B: Exports unaffected directly; depends on net exports, not investment.
• C: Incomes fall with lower GDP and wages.

Not enough information to select an "increase" option—all predict decreases.

Final answer: None