Why do developed countries need to grow the middle class? I think the idea is that we want them to grow the middle class so that there are more people with disposable income and expensive appetites to sell to. Because we can't really compete with developing countries for price on most consumer goods.
"Grow the middle class" definitely implies that people are moving from the lower class to the middle class, which IS doing something for the people in the lower class.
"Grow the middle class" definitely implies that people are moving from the lower class to the middle class, which IS doing something for the people in the lower class.