The stalk market badge in New Leaf has a badge for making a profit selling turnips. The bronze requires a total cumulative profit of 500,000 bells. I'm interested to know how this is calculated - if you keep making a loss every week, do you end up with a massive negative overall profit (which you'd have to claw back before you could even begin working back towards the badge), or does it bottom out at zero?
For example, let's say we spend 100,000 bells on turnips one week, and only sell them for 50,000. Is my total profit now -50,000 or zero?