// aggregate type, e.g. sum, something else
//
public static AssetValuation GetValue(IList <InstrumentControllerBase> listIPriceable, IInstrumentControllerData modelData)
{
var list = listIPriceable.Select(pr => pr.Calculate(modelData)).ToList();
AssetValuation sum = AssetValuationHelper.Sum(list);
return(sum);
}