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The problem with Uber for romaine is that it takes at least a month to fill the demand for romaine. Anyone with a car could, potentially, sign up and fill a ride request. In practice, this might not be a big problem if the shortage is longer than the time it takes to grow romaine. This is where my mind was going with this but it would require people to have equipment sitting idle or be growing romaine lettuce anyways and sell it when the price is high enough.