看到一个题目是针对这段话说错误的点
”I am perplexed by the bottom-up capability that Alpha claims to have in adding value to portfolios. They claim to have a bias to yield maximization across securities without regard to rating differentials“
答案：Total return framework is a superior framework for assessing potential performance than yield measures.
请问这里的total return framework指的是什么呢，他为什么会比看yield要更好（我这里理解的yield是cash flow yield）
