Linq awesomeness for selecting items from a list by their domain name

gistfile1.cs

    public class Trade
    {
        public virtual int TradeId { get; set; }
        // some other fields...
        public virtual int? PrimaryOrOpposingIndicator { get; set; }

        public static Func<Trade, bool> isStreetSide = x => x.PrimaryOrOpposingIndicator == 1;
        public static Func<Trade, bool> isClientAllocation = x => x.PrimaryOrOpposingIndicator == 3;
        public static Func<Trade, bool> isBlockLevel = x => x.PrimaryOrOpposingIndicator == 4;
        public static Func<Trade, bool> isStreetSideOrBlockLevel = x => x.PrimaryOrOpposingIndicator == 1 || x.PrimaryOrOpposingIndicator == 4;
        public static Func<Trade, bool> isClientAllocationOrBlockLevel = x => x.PrimaryOrOpposingIndicator == 3 || x.PrimaryOrOpposingIndicator == 4;
    }


    public class TradeCalculator : ICalculate
    {
        public void Calculate(IEnumerable<Trade> trades)
        {
            trades.Where(Trade.isClientAllocationOrBlockLevel).Each(trade =>
            {
                // perform some calculation here...
            });
        }
    }

Those fields are public so you can change them, I presume? Like dynamically change how the class behaves?

They're public (but should be readonly) because other classes, such as calculators, use them..