Parents turn to costume swap to cut Halloween costs

1. 核心事实剥离

• 事件本质：报道显示家长通过交换或采用免费替代品降低万圣节服装成本，最值得跟踪的是可选服饰销量、促销强度与零售商毛利，而非单一“节俭”叙事。〔SRC〕〔SRC:"One mother said Halloween outfits are \"completely extortionate\" as families pick up free alternatives."〕
• 交易价值判定：no-trade。理由：目前只有单一家庭的成本感知