Money going into capital markets is not automatically productive. Buying bonds and shares from the issuing company (or through an intermediary) is productive because you're helping them expand production in exchange for future profits.

Trading on the stock market is not productive by definition. None of the money is actually invested in a company that would use it to open a factory or develop a new product. It's just as zero sum as gambling, but the ones who lose the most are the people who can't afford to participate.