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There is a name for the addition of consumer effort to increase someone's estimation of value. It should perhaps be called the Betty Crocker effect, since they spotted it first, but it's instead known as the IKEA effect, because the furniture chain's eccentric billionaire founder Ingvar Kamprad was convinced that the effort invested in buying and assembling his company's furniture added to its perceived value. When working with IKEA I was once advised: 'Do not, under any circumstances, suggest ways of making the IKEA experience more convenient. If you do, we shall fire you on the spot.'