Keep an eye on the news as well to see which stocks are doing good or bad.
The old trick of buying low and selling high still applies to GTA V.
Our Assassination Investor page details the steps required for developing your finances beyond the Billion dollar mark The best way to make a lot of money in the story mode of GTA 5 is to complete Lester's stock market assassination missions. Looking to build up your bankroll in GTA Online? Read our Making Money in GTA Online page and you'll soon be swimming in a sea of luxury and decadence.