We suggest the use of the wavelet-approach to determine optimal
hedge ratios in order to adjust risk management positions to planning horizons.
The wavelet-approach permits resolution of the signal in terms of the time scale
of analysis. We analyse the wavelet correlations between several time series
and find significant differences in short-term and long-term correlations
between exchange rates and ‘background risks’. At the same time, we do not
find such a difference between spot and future rates for most exchange rates.