I recently wrote a Guest Blog Entry for the Moolanomy blog entitled The Difference Between the Multiply-by-25 Rule and the 4-Percent Rule.

Juicy Excerpt:  I believe strongly that the 4-Percent Rule at some times overstates and at other times understates the amount needed for a safe retirement; at times of high valuations the true safe withdrawal can drop to as low as 2 percent and at times of low valuations it can rise to as high as 9 percent. The Multiply-by-25 Rule isn’t by itself perfect either. There are times when obtaining a 4 percent return is child’s play and there are times when you need to go hunting for a mix of asset classes that will provide that level of return.