Jews and the Stock Market
Jewish ethics of stock-market investment and speculative activity
Likewise, our sages were concerned that one particular kind of speculation--namely, betting on disaster--may sometimes have a negative effect on the solidarity of our society.
Most kinds of speculation are not regulated by Jewish law and are considered perfectly acceptable. However, each individual speculator should occasionally make sure that he has not created a situation where he is "betting against the home team" and subtly alienating himself from the community.
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