Your friend's investment has great unsystematic risks. If it fails, after ten years, A may not have any left, and B may only have 20,000 to 30,000 left. Risks and benefits are related to the same project. You didn't take any risks, so naturally you can't ask for extra benefits. Also, you said that your environment is the same, but in fact it is completely different. The surrounding environment of three people is completely different, and the result will naturally be different.