def consoO(R,s,tau,w):
    """Compute the consumption of the old agents
    
    Args:
    
    
        R (float): gross return on saving
        s (float): savings
        tau (float): percentage of contribution  of the wage of the young agent
        w (float): wage
        
        
    Returns:
    
        (float): consumption of the old agents
    
    """
    return R*s+tau*w