Set forth below is the text of a comment that I recently posted to the discussion thread for another blog entry at this site:
“Do you believe that it is possible to calculate the safe withdrawal rate accurately without taking valuations into consideration?”
It depends on what you mean by “safe withdrawal rate”.
The Greaney study (and other similar studies) were very clear in what they were calculating. They calculated the inflation adjusted withdrawal rate that survived 30 year periods in the past.
The rate you are looking for (I believe) is what rate is going to survive in the future. Those are two different things.
I agree that the Greaney study and other similar studies calculated (properly, in my assessment) the Historical Surviving Withdrawal Rate (HSWR).
I agree that that is different from the Safe Withdrawal Rate (SWR). I generally agree with your description of what the safe withdrawal rate is. People want to put together retirement plans and they want to know what withdrawal rate will work even in a worst-case scenario in order to do so. Many of the people who posted at the Retire Early board were planning on leaving high-paying corporate jobs. They did not want to hang on too long because they were anxious to get on with their plans. But they also did not want to leave their jobs before they had saved enough to be virtually certain that their plan would survive for 30 years.
One small change that I would make in your language is to note that the safe withdrawal rate is not necessarily the withdrawal rate that will work in the future. There is no way to identify that number since no one knows the future. The purpose of safe withdrawal rate analysis is to identify the withdrawal rate that will work in the future in a worst-case scenario <b>presuming that the market continues to operate in the future at least somewhat as it has always worked in the past. </b> Since the valuation level that applies on the day the retirement begins has in the past always affected what withdrawal rate would work, valuations have to be taken into consideration to identify the withdrawal rate that is virtually certain to work in the future. </b> A calculation that does not consider valuations is not a safe withdrawal rate calculation. You are saying there that you agree with that. But then I can’t help but wonder what all the fuss has been about.
Please recall that my famous post from the morning of May 13, 2002, did not say that the Greaney study was in error (I did say that later but not in the first post). That first post asked a question — Should we be taking valuations into consideration when calculating the safe withdrawal rate? I believe that we should be and hundreds of our fellow community members said that I started the most interesting and helpful discussion in the history of that board community by putting that question on the table. That’s the discussion that we need to have today at every discussion board and blog on the internet — Should investors be taking valuations into consideration when forming their stock investment strategies?
I say that they should. There is only one difference between Buy-and-Hold and Valuation-Informed Indexing. Buy-and-Holders never take valuations into consideration (because it was believed at the time that Buy-and-Hold was developed that the market was efficient and thus that valuations did not matter) and Valuation-Informed Indexers always take valuations into consideration (because valuations are always a critically important factor).
If you are okay with me saying that valuations must be considered to calculate the SAFE withdrawal rate accurately, we have no dispute. I of course agree with you that Greaney calculated the SURVIVING withdrawal rate properly. But I do not feel even a tiny bit comfortable saying that the SAFE withdrawal rate is always 4 percent. I believe that the safe withdrawal rate is a number than changes with changes in valuation levels. It can drop to as low as 1.6 percent and it can rise to as high as 9,0 percent. If I were to say that the safe withdrawal rate is always the same number, I would be engaging in fraud. I do not believe that. So I am not willing to say that I believe that.
Rob


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