Question

Do investors in the stock market have a beneficial or harmful effect on the companies whose stocks they buy and sell

Answer 1

It can be both but more likely beneficial because the investors wants to make a profit not a loss

Answer 2

Answer: More beneficial than harmful, but both of them in the end.

Explanation: We must know that stock investments are a constant game of winning and losing, you just need to know when to forfeit in order to keep your revenues on the top.

Over-winning can also be a bad sign on stock, it could mean that sooner or later you won´t be able of supply your product to your clients.