价值效应

def solve(____):
    high_bm_return = value_portfolios["____"]
    low_bm_return = value_portfolios["____"]
    value_premium = high_bm_return - low_bm_return
    return {"____": high_bm_return, "____": low_bm_return, "____": round(____), "____": value_premium > ____}