What pricing model to use to compute strategy quotes.
*The Cash pricing method converts each leg price to Cash (i.e. Cash=Ticks*TickValue/Numerator) and aggregates all legs with multipliers.
*The Ticks pricing method uses each leg Tick directly and aggregates all legs with multipliers.
*The Decimal pricing method converts each leg price to Decimal (i.e. Decimal=Ticks/Denominator) and aggregates all legs with multipliers.
*The Yield pricing method converts each leg price to its equivalent yield value and aggregates all legs with multipliers. Only supported for treasuries.