* @see de.olivergierke.whoops.core.TransactionFeeProvider#getTransactionFee(de.olivergierke.whoops.core.Instrument)
*/
public BigDecimal getTransactionFee(Instrument instrument) {
Option option = (Option) instrument;
Instrument underlying = option.getUnderlying();
TransactionFeeProvider provider = feeProviders.getPluginFor(underlying);
BigDecimal fee = provider.getTransactionFee(underlying);
return fee.multiply(multiplier);