Match target return to company size automatically and also provide a way to override the values.
Instead of using a 15% target return for every stock, reduce the target return to the level appropriate to the company size. A medium size company would have a target return of 12%, etc. This might help newbies realize that 15% growth is not necessarily realistic for large companies. Also, could help get users looking at the return of their entire porfolio.
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I moved my vote for this to a previous idea about target returns and being able to customize them. Couldn't figure out how to delete this idea (which is redundant).