def init_risk_div_const():
    r = 0.01  # risk free interest, https://www.statista.com/statistics/885872/average-risk-free-rate-switzerland/
    d = 0.025  # dividend perstock, https://www.dividend.com/how-to-invest/comparing-dividend-stock-sectors-by-yield/
    D = 10;
    return r,d,D