Professional Trader, can be a good job if you have good skills and know the market where you are investing.
Trading can be a long-term skill that can be convenient in any generation since we always have currency that we will use in everyday life we do. You can also have a good knowledge in economics once you start trading.
I think it's not necessarily important to learn economics for you to do trading, you just need to know the coin and learn when is the best moment to buy or sell. Once you knew this things, I think you can start trading already.