“Tora knowledge does not make one an advisor as to which of two permitted stocks to buy.”
Permission to buy stocks at all is a chiddush, as neither the Torah nor Chazal ever heard of limited liability. 😉
Given that most mutual funds can’t even match the market average, it is questionable whether there are any real experts on investments other than Warren Buffett! If you actually know something about the business, the technology, and the management, you might know enough to be a wise investor, but that would be few of us.
But my comment was really regarding operating your own business. There is so much that is completely acceptable by secular law that is not permitted halachically. The Torah’s standards regarding transparency, treatment of employees, pricing, and other areas are far higher than is standard in the market today. Rabbi Dr. Aaron Levine z’tz’l wrote that had the economy followed Torah standards of transparency there could have been no crash in 2008.
“any posek will consult professionals in the field before paskening. For example, Rav Moshe asked an electrician what would happen if someone tovelled a toaster.”
Absolutely! Rav Moshe z’tz’l was a model of such. He also consulted prominent physicians before paskening on medical matters.
I have on very rare occasions been asked questions by a rabbi on areas of my expertise.