逆向选择

def solve(____):
    avg_quality = sum(____) / len(____)
    willing_price = buyers["____"] * avg_quality
    participating_sellers = [s for s in sellers if s["____"] <= willing_price]
    adverse_selection = len(____) < len(____)
    return {"____": round(____), "____": round(____), "____": len(____), "____": adverse_selection}