def BSMlambda(delta: float, S: float, V: float) -> float:
    """Not really a greek, but rather an expression of leverage.

    Arguments
    ---------
    delta : float
        BSM delta of the option
    V     : float
        Spot price of the option
    S     : float
        Spot price of the underlying

    Returns
    -------
    float
        lambda

    Note
    ----
    Percentage change in the option price per percentage change in the underlying asset's price.
    """
    return delta*(S / V)