垄断竞争市场特征

def solve(market_features):
    required = ["大量厂商", "产品差异化", "自由进出"]
    met = [f for f in market_features if f in required]
    is_monopolistic = len(met) >= 2
    return {"市场特征": market_features, "满足条件数": len(met), "是垄断竞争市场": is_monopolistic}