It doesn't seem to me that anyone has discovered much that's new since the Iliad or the Odyssey.
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I went to Ethiopia, and it dawned on me that you can tell a starving, malnourished person because they've got a bloated belly and a bald head. And I realized that if you come through any American airport and see businessmen running through with bloated bellies and bald heads, that's malnutrition, too.
The idea of confidence, of the emotions of the population, is an incredibly important one in economics. John Maynard Keynes called it 'animal spirit.' And if people are feeling generally good about the future, they're more likely to spend money, to start new companies; companies are more likely to hire people, make investments.