A man who hasn’t had much experience, and doesn’t think, is apt to measure a nation’s prosperity or lack of prosperity by the mere size of the prevailing wages; if the wages be high, the nation is prosperous; if low, it isn’t.
 Mark Twain, A Connecticut Yankee in King Arthur's Court (1889). copy citation

Context

“I made various acquaintanceships, and in my quality of stranger was able to ask as many questions as I wanted to. A thing which naturally interested me, as a statesman, was the matter of wages. I picked up what I could under that head during the afternoon. A man who hasn’t had much experience, and doesn’t think, is apt to measure a nation’s prosperity or lack of prosperity by the mere size of the prevailing wages; if the wages be high, the nation is prosperous; if low, it isn’t. Which is an error. It isn’t what sum you get, it’s how much you can buy with it, that’s the important thing; and it’s that that tells whether your wages are high in fact or only high in name. I could remember how it was in the time of our great civil war in the nineteenth century.” source