That's a good point. My initial thought process with it was to stack the datasets so that everything underneath debt contributes to your net worth, with debt at the top "weighing it down" so to speak. You can also click the debt checkbox in the legend to hide that dataset from the plot. Still, your point stands that the stacked chart doesn't quite visualize the negative effect that debt has on net worth. Do you prefer the "Net Worth Over Time" plot?

I think that approach of having debt on top would only work if you made the "sum of all assets" line somehow highlighted; thicker, bolder, etc. But I think that approach is still going to result in an unintuitive chart. (And I think that's fairly important, since this chart is the biggest part of the default view in your app.)

My main product design point here is that in a stacked chart like this, you want the summed line to have _some_ meaning - since the summed level is the most prominent feature of this type of graphic.

Here, as you're summing assets together with debt, it makes the sum meaningless - which is a flag that this visualisation isn't suited to the data you're putting into it. I think the simplest fix to this (without coming up with some new more complex visualisation) is just to lop off the debt. In your current product model, that might mean just making it unticked by default.

Assuming you were evolving this product longer term, I'd reckon it'll be important at some stage to visualise both positive and negative quantities. Maybe something like a two-side stacked chart? https://www.anychart.com/products/anychart/gallery/Column_Ch...

Thanks for the suggestion! I could certainly show debt as negative, similar to that stacked column chart. Do you think that would be more intuitive? Or would people get confused and think they have "negative debt" or something?