The conservative folks I talk to always, always, always bring up the price of eggs and the price of gas when they are talking about how bad the economy is these days.
I've heard "Groceries have doubled in price." many times. Obviously I can't prove that's not true for them, but then I ask what items that they buy regularly have doubled in price? The answer: "Eggs".
Okay, so what else, I know that eggs alone do not make up your entire grocery bill? "Everything". That's pretty much all I get.
Even if they can tell me a few more things that have doubled in price, it's basically going to be outliers or things I know for a fact they rarely/never buy. Like when it comes to the eggs, they'll make claims like "eggs are $10 a dozen", but when pressed about it, you find out they're talking about the gourmet premium brand that's always been way more expensive than the cheap ones and which they've never purchased in their entire lives.
Caffeine these days.