What is the most profitable activity in gta v?

The Wikipedia article for Grand Theft Auto V outlines the game's setting, main protagonists, and general gameplay mechanics such as exploring the open world and completing heists. It describes the story arc involving Michael De Santa, Franklin Clinton, and Trevor Philips, and mentions that players can roam freely on foot or in vehicles. However, the article does not detail or compare in-game activities with respect to their profitability or earnings. Consequently, based purely on the verified evidence given, there is no basis to determine which activity yields the highest profit in the game.