The best way to earn large sums of money in Grand Theft Auto 5 is through the stock market.

To invest in the stock market, either use the web browser or the in-game mobile phone. The two stock exchanges are LCN and BAWSAQ.

Utilizing the LCN stock exchange is the easiest way to see a return on your investment as it is directly connected with your actions in the game. However, the BAWSAQ exchange is more unpredictable since it is dependent on the GTA 5 gaming community via Rockstar Social Club.

If you're unsatisfied with your return on investment, there are ways of increasing your stock. One way is by having all three of your characters invest heavily in one stock and then negatively impacting a rival company's business. This will drive your company's stock prices up. An illegal way of doing this is by assassinating the boss of the rival company.

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You can also go on Assassination Missions and get higher returns on stocks. In the LCN exchange, invest in Debonaire Cigarettes if you're about to start the Multi Target Assassination. Invest in GoldCoast if you're starting the Construction Assassination.

For the BAWSAQ exchange, invest in BetaPharmaceuticals if you'll be starting the Hotel Assassination. Before the Vice Assassination, invest in Fruit.

In the Bus Assassination you don't need to invest in anything but it's possibly to invest in Vapid if you wish.

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For more on working the stock market and using assassination missions in Grand Theft Auto 5 watch the video below: