The money multiplier is given by the formula:
m = \frac{1}{c + r}
where
- c is the currency-deposit ratio
- r is the reserve-deposit ratio
Given that the reserve-deposit ratio is 0.23 and the currency-deposit ratio is 0.21, we can substitute these values into the formula:
m = \frac{1}{0.21 + 0.23}
m = \frac{1}{0.44}
m = 2.27
\boxed{m = 2.27} is the value of the money multiplier.