Stale data is a crime
I just opened the browser and went to my portfolio, and saw a bunch of data I didn't like. So I went to another portfolio with some of the same stocks in it and saw all different data. So I went back and the data that was there refreshed and became current. Why doesn't the page load current data when first opened? Why do I have to browse around or refresh it to get new current data? Old data is worse than useless, it's disinformation. Is your goal to cause people to make financial errors? The SEC would like to know about that sort of thing.
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Ole Haslund commented
when data is refreshed and become "true" the daily gain is still wrong, and reflect the initial value :-(