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Got a large cash sum, wanna buy stocks. Should I buy all at once, or spread it over time?
Depends on what you are, an investor or a speculator. An investor will look at an 'indefinite' investment period. A speculator will be after a fast buck. If you are an investor, buy your stock once as that will cost less commissions. After all, you'll sell your stock in 10, 15, 20 years.