And in this case, our approximation would be really good. It would probably be exact for W. And if W's slope, for whatever reason, goes negative after that point, and they already tell us this is an increasing function, so that is not likely. Well, it doesn't have to even go negative. If W's slope decreases, it could still stay positive. And the way I drew it doesn't, let me draw it like this, just to make it clear. So let's say that, let's say we find out that the slope looks something like this. This is the slope of the tangent line at time equals 0.