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Investing or gambling should not go by any means for poor people as he should work harder so that his financial condition can improve. But if he feels that he can deposit a portion of his disposable income every month, he should go for DCA method so that he can run long-term deposits and build up a pile.
If he was poor from the start and his income was just enough, why would he gamble or invest? People who gamble or invest are people who have enough income - where he has met his needs and is ready to lose his money. If someone is poor, what he should prioritize is meeting his family's needs and saving for his family's future, because that is the most important thing - even if he wants to invest or gamble, then he can do it sometime in the future if he is ready.
As much as you are right, I still will disagree with you based on my personal philosophy and principles, and such is that, a poor man must strive, work hard to become rich, and how does a poor man changes his level and become rich?
One of the hows; is for the poor man to try as much as possible to do or participate in some of the things rich men do or participate in, the poor man doesn't necessarily have to force himself up to the standard or level of the rich men, but he can still even at his own small level, participate in the activities the rich men participate in.
For example, if rich men are investing to become even more rich, poor man should invest too.
If rich men gamble as a way to have fun and possibly win some money which could serve as a cover for some current expenses at that very moment, then poor man should from time to time try his luck too.
If rich men are investing $1000, the poor man can invest maybe $1, $2, or maybe $50 or $100, depending on what amount he can comfortably afford to lose.
If the rich man is spending $1000 on bets, gambling, the poor man can try his luck with $0.5 to maybe $1, or $2, or $3, again depending on what he can comfortably afford to lose.