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Are lottery tickets ever a wise investment provided the jackpot is large enough?
A lot of these answers are really weak. The expected value is pretty much the answer.  You have to also though, especially as many many millions of tickets are purchased--make part of the valuation the odds of the jackpot being split x ways. So about 1 in 290--> the jackpot needs to be a take-home pot of $580 million for the $2 ticket. Assume the average # of winners is about 1.5 so half the time you're going to split the pot, bringing the valuation needed for the same jackpot to be $870 million. It's actually somewhat not common to have split jackpots because the odds are very bad + many people pick 'favourite numbers'.