def getStates(self):
        '''
        Calculates updated values of normalized market resources and permanent income level for each
        agent.  Uses pLvlNow, aNrmNow, PermShkNow, TranShkNow.

        Parameters
        ----------
        None

        Returns
        -------
        None
        '''
        pLvlPrev = self.pLvlNow
        aNrmPrev = self.aNrmNow
        RfreeNow = self.getRfree()

        # Calculate new states: normalized market resources and permanent income level
        self.pLvlNow = pLvlPrev*self.PermShkNow # Updated permanent income level
        self.PlvlAggNow = self.PlvlAggNow*self.PermShkAggNow # Updated aggregate permanent productivity level
        ReffNow      = RfreeNow/self.PermShkNow # "Effective" interest factor on normalized assets
        self.bNrmNow = ReffNow*aNrmPrev         # Bank balances before labor income
        self.mNrmNow = self.bNrmNow + self.TranShkNow # Market resources after income
        return None
Calculates updated values of normalized market resources and permanent income level for each
        agent.  Uses pLvlNow, aNrmNow, PermShkNow, TranShkNow.

        Parameters
        ----------
        None

        Returns
        -------
        None