an example of successful market strategy:
When Rav Huna was told that he is wrong not paying workers who already stole from him and paid them: either vinegar (literal “stock”) became wine, or price (NYSE stock) of vinegar went up. Maybe there is an economic pshat here: when people behave positively towards each other, there is less mistrust in the market, and the stocks go up. Similarly, Yaakov “created markets” and also urged shepherds to work the full day honestly without mistrust to each other.
Another way to invest is in your own skills: have a profession/skills that is not tied to dealing with speculative things, like stock markets, but to something that can be useful in any market: plumbing, medicine, teaching and then you’ll survive the downturn.