Such a marketplace metaphor definition of truth, however, is not without its difficulties. To begin with, it does not make sense when applied to empirical and scientific knowledge; there are many beliefs, such as astrology, that are scientifically false, yet popular. And when applied to ethics or politics, where the truth that emerges can be identified with the best answer for society at that point in time, the extreme relativism of a marketplace-defined truth is unlikely to be acceptable.—Humanism and the Rhetoric of Toleration, page 254
That's the end of this book. Sorry to end it on such a sour note, but that pretty much defines where we are as a society right now. The marketplace is our god. Not just economically, but in our ethics, social policy, and international policy. It's a variation of might makes right. All we've done is substitute economic muscle for the sword. Of course, we use the sword to enforce that economic might.
So much for an ethic based on the Sermon on the Mount. You don't get rich giving to those who ask and not charging interest or asking for it back! At least not economically rich. But there are other forms of riches of which the economically rich know not.