Headline fail. If they're going to introduce an article with the words "What about economists?" they should maybe quote at least one (rather than make a vague hand wave to "critics say")
The Economist originated as an organ of the free trade movement, particularly concerned with the repeal of the corn laws. I believe that the title was meant to articulate that free trade was a more principled and intellectually defensible political position than protectionism.
I can't say I think the title reflects the contents of the article well enough, but I guess The Economist is suggesting that their evaluation is economically sophisticated.
Cf. http://mitpress.typepad.com/mitpresslog/2007/01/from_corn_la...