Sometimes a tiny flaw makes a product more desirable than perfection. If you’re a coin collector, you already know this: The coins worth the most are often the ones that left the mint with tiny imperfections. Like a misprint. An off-centre strike. Or a missing detail. The mistake becomes the whole story. Fascinatingly, a marketing study found the same effect with consumer products. People consistently preferred products described as having been created by mistake over otherwise identical...