def CRRAutilityP(c, gam):
    """
    Evaluates constant relative risk aversion (CRRA) marginal utility of consumption
    c given risk aversion parameter gam.

    Parameters
    ----------
    c : float
        Consumption value
    gam : float
        Risk aversion

    Returns
    -------
    (unnamed) : float
        Marginal utility
    """
    return c ** -gam
