Don't buy the book because it's on sale. Don't eat the pastries because they're free. When most of the cost isn't financial, do not be persuaded by price.
Also, it's surprisingly often the case that most of the cost isn't financial.
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And/or: the financial cost is hidden and far in the future.
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That'll so true, think of health physical and mental.
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The original tweet and your reply are true not just for costs but also for benefits.
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