QUESTION OF THE DAY. From Blogs for Industry.

The baby boom fallacy is a product of not remembering your high school* calculus - a drop in the rate of increase of a thing (second derivative) will only result in a drop in the amount of that thing if the overall rate of change (first derivative) goes negative.

The footnote inquires about calculus learned in college. And if you have, be ashamed if you can't explain why, although we speak loosely of the limit as x "goes to" c, the limit exists although x does not have to go anywhere.