吉芬商品判断

def solve(____):
    total_effect = substitution_effect + income_effect
    if income_effect < ____ and abs(____) > abs(____):
        is_giffen = True
    else:
        is_giffen = False
    return {"____": substitution_effect, "____": income_effect, "____": total_effect, "____": is_giffen}