The problem comes from the making of pies in order to satisfy pie demand. European pies (also called "tartes") are currently sinking in value due to too much greek yogurt. The Chinese have been avoiding making more of their own pies because the global market for china-produced pies is high as long as they don't cost too much, but lately they've developed a taste for good 'ol Apple pie and have decided that they're going to leverage their increasing population of potential pie purchasers to get the US to make LOTS more pies in order to devalue the American pie market.
Meanwhile Greece is going back to eating cake.
Go Go Metaphor!