"Now we have to overcome some big challenges, I will admit that. First, too many of our representatives in Washington are in the grips of a failed economic theory called trickle down economics. Now, I do not doubt their sincerity. But it has been proven wrong again and again. But there still are people in Congress who insist on cutting taxes for the wealthy instead of investing in our future. They careen from one self- inflicted crisis to another. Shutting down the government, threatening to default on our national debt, refusing to make the common-sense investments that used to have broad bipartisan support, like rebuilding our roads and our bridges, our tunnels, our highways, our airports. Or investing in better education from zero through high school and college. … And if the evidence were there to support this ideology, I would have to acknowledge that. But we have seen the results. Twice now in the past 30 years, a Republican president has caused an economic mess and a Democratic president has had to come in and clean it up."-- Democratic presidential candidate former Secretary of State Hillary Clinton, June 22, 2016.
Comment: There are lots of things going on here. Where has it been proven that so-called "trickle-down economics" is a failed policy? Where has this policy been tested rigorously – that is, against an otherwise-identical control group? Such experiments are difficult to craft, and almost never occur on a large scale. It may be true that there have been cases where trickle-down economics has been implemented and bad economic news has followed, but it's propter hoc reasoning to jump to the conclusion that the former caused the latter. Correlation isn't necessarily causation. (Perhaps the bad economic news would have been even worse without the trickle-down policies, it's impossible to know unless you set up a control group for comparison.) Also, who has proposed not investing in our future? Perhaps people have proposed tax cuts for the wealthy along with spending less on investment than Clinton supports, but is there anyone who has said we shouldn't spend any money on education or infrastructure? This sounds like a straw man she's setting up to knock over. Finally, Clinton also resorts to "common sense" rhetoric, as well as "bipartisan" rhetoric (if the Republicans aren't supporting common-sense investments, then how can they have bipartisan support?).