Investment multiplier can be derived from (symbols have simple meaning)
A. $$\frac{1}{{1 - \frac{{\Delta C}}{{\Delta S}}}}$$
B. $$\frac{1}{{1 - \frac{{\Delta C}}{{\Delta Y}}}}$$
C. $$\frac{1}{{1 + \frac{{\Delta C}}{{\Delta S}}}}$$
D. $$\frac{1}{{1 + \frac{{\Delta C}}{{\Delta Y}}}}$$
Answer: Option B

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