class Stock:
    
    def __init__(self, price, volatility, riskfreeRate, dividendYield, 
                 code='Stock', entityType='Stock'):
        self.code = code
        self.entityType = 'Stock'
        
        self.price = price
        self.volatility = volatility
        self.riskfreeRate = riskfreeRate
        self.dividendYield = dividendYield
        
    def serialize(self):
        return {
                "code": self.code,
                "entityType": self.entityType,
                "price": self.price,
                "volatility": self.volatility,
                "riskfreeRate": self.riskfreeRate,
                "dividendYield": self.dividendYield,
                }