one of the issues we don't think about is that the returns we think we get and the money we should have by retirement is always looked at as pre-inflation. as well as pre lots of other factors .
you know the drill ,markets returned an average of 9-11% or so and you get the nice graph showing a huge amount 40 years later if you contribute the max to your ira..
well things like adjusting allocation as you get closer to retiring . real world volatility, dollar cost averaging and inflation all have the math wrong.
all alter those expectations big time but rarely are these factors considered.
it looks great when you look at these growth charts and see you will have over a million at retirement but if that is decades from now it is a different ball game as well as you will not have that balance.
throw in volatility and when markets are down 50% and need to double to get back to where they are the compounded average returns work differently then the arithmetic returns..
dr pfau ran some numbers looking at what we thought our compounding was vs what we really see.
dr pfau looked at a nice chart a financial author had in his book illustrating how if you saved 5k a year for 40 years at the average historical market returns you would have 1.3 million dollars.
in fact dr pfau found that the 1.3 million dollars on the graph in todays dollars and with real world mathamatical forces and real world investor actions as they age may be more like 300k .
i think i will cry now after reading this lol.
very interesting paper as usual from dr pfau.
for those not familiar with dr wade pfau ,he is one of the high level researchers today who's papers have been known to set the tone for the financial planning industry.
he is a featured writer for the journal of financial planning which is the equal to the ama's medical journal.
i can tell you when dr wade speaks an entire profession takes notice. they might not always agree but the words this man writes carry alot of weight .
Retirement Researcher Blog: Compound Interest and Wealth Accumulation: It's Not As Easy as You Think