Originally Posted by Creasy47
Also, with 'Trading Pure Alpha,' if you don't want to risk your money, there's a random event where a man's car has broken down and he needs you to rush him to the airport. When you get there, he will tell you to buy certain stocks because you're guaranteed to make money. It seems guaranteed that this will 100% net you some cash, though it isn't a big risk otherwise. Hope this helps anyone having troubles.
Also all the assassination missions will change the stock market. The easiest to remember is the Redwood Cigarettes one. Just invest in the other cigarette company.