To determine the revalued portfolio value two approaches can be used. The simpler
approach requires the previously calculated delta amount for each position to be
multiplied by each of the past changes in the relevant exchange rate. Recall that
delta measures how much the position value will change if the exchange rate
changes by 1 per cent. If the past actual change in the exchange rate is, say, 0.16 per
cent then the portfolio value will change by 0.16 ´ delta. The second, more arduous
approach is to revalue each position in the portfolio at each of the past exchange
rates. For linear positions (that is, positions the values of which change linearly with
changes in the underlying market prices) the two approaches will yield the same
result. However, for non-linear positions, such as positions in complex options, the
first approach may substantially under or overestimate the change in the value of the
position and thus may not generate an accurate measure of market risk exposure.
To determine the revalued portfolio value two approaches can be used. The simpler
approach requires the previously calculated delta amount for each position to be
multiplied by each of the past changes in the relevant exchange rate. Recall that
delta measures how much the position value will change if the exchange rate
changes by 1 per cent. If the past actual change in the exchange rate is, say, 0.16 per
cent then the portfolio value will change by 0.16 ´ delta. The second, more arduous
approach is to revalue each position in the portfolio at each of the past exchange
rates. For linear positions (that is, positions the values of which change linearly with
changes in the underlying market prices) the two approaches will yield the same
result. However, for non-linear positions, such as positions in complex options, the
first approach may substantially under or overestimate the change in the value of the
position and thus may not generate an accurate measure of market risk exposure.
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To determine the revalued portfolio value two approaches can be used. The simpler
approach requires the previously calculated delta amount for each position to be
multiplied by each of the past changes in the relevant exchange rate. Recall that
delta measures how much the position value will change if the exchange rate
changes by 1 per cent. If the past actual change in the exchange rate is, say, 0.16 per
cent then the portfolio value will change by 0.16 ´ delta. The second, more arduous
approach is to revalue each position in the portfolio at each of the past exchange
rates. For linear positions (that is, positions the values of which change linearly with
changes in the underlying market prices) the two approaches will yield the same
result. However, for non-linear positions, such as positions in complex options, the
first approach may substantially under or overestimate the change in the value of the
position and thus may not generate an accurate measure of market risk exposure.
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