如果我回答The recent corporate tax reform will have long-term positive effect on equity market return.Historical method assume the historical patterns will repeat.是不是不足以说明问题，需要加一句VAR derived from historical data don’t incorporate recent changes?
觉得这个题目问的是我们背下来的historical method的缺点，但做真题时经常感觉到背下来的内容需要做一些补充说明才能回答清楚，想问一下是否有必要？
