public Broker(string name, StockMarket stockMarket) : base(name, stockMarket)
{
}
public Bank(string name, StockMarket stockMarket) : base(name, stockMarket)
{
}
protected TradeSubject(string name, StockMarket stockMarket)
{
Name = name;
_stockMarket = stockMarket;
stockMarket.RegisterHandler(Update);
}