Subject: Re: Krugman: Gaming Out a Sudden Stop
That is also how I did the arithmetic looking at the Y axis. Is there another way to do the arithmetic? I learned that it didn't matter what was your viewpoint, 2+2=4, ...

Right, but flagellating the expired equine a bit more, Y axis numbers were +/- 10...90.
90 * .1M / 1B = 9/1000.