Hi Guys,
I submitted the following post to the MFO discussion group in late January recommending Monte Carlo simulations as a means to scoping the huge uncertainties with the
retirement decision and an acceptable drawdown rate that generates a high likelihood of portfolio survival for the entire projected
retirement period.
I believe it is applicable to the current discussion so I repost it here:
Retirement decisions are surely among the most difficult and stressful that anyone but everyone must eventually address. And the most successful
retirements will be achieved the sooner that that issue is confronted; the earlier the better.
Up until just 20 years ago, that vexing problem could only be insufficiently analyzed using deterministic methods that completely failed to capture the uncertainty of future portfolio returns and its volatility.
Recently, these forecasting deficiencies could be mostly relaxed using Monte Carlo simulation calculators. I say relaxed because the uncertainties of the future marketplace can never be removed. However, Monte Carlo techniques can parametrically explore the impact of these uncertainties on portfolio survival likelihoods given various withdrawal rates. With super speed, these Monte Carlo simulations will estimate
retirement wealth survival for whatever scenario the simulation user elects to study. Portfolio survival probabilities are the final output.
These calculations are completed with lightening speed on numerous websites these days. Here are Links to two such sites:
http://www.moneychimp.com/articles/volatility/montecarlo.htmhttp://www.flexibleretirementplanner.com/wp/The first Link is to the MoneyChimp site. It is simplicity itself and allows for both a pre-
retirement portfolio estimated return and volatility and a post-
retirement projected return and volatility. It is extremely fast as it performs 1000 random simulations. Since the controlling returns are randomly selected within the machine, identically repeating the same calculation will generate a slightly different probability outcome.
The second Link is to the Flexible
Retirement Planner site. It is slightly more complex than the MoneyChimp site, but it is also more detailed in its analyses. For example, it divides your portfolio into taxable, deferred tax, and tax free components. Also it permits several spending options during the drawdown phase of the
retirement.
Both sites provide excellent Monte Carlo simulators. I recommend you try both of them. Do numerous “what if” scenarios to test the survivability robustness of your approaching
retirement.
I am certain that these Monte Carlo analyses will better inform your savings, your
retirement date, and your portfolio withdrawal rate decisions.
I resorted to Monte Carlo computations when making my
retirement decisions, and believe they emboldened me and gave me some needed comfort. By way of full disclosure, I did not use the two simulators that I referenced; they were not available at my critical moment.
When dealing with uncertainty and not deterministic events, Monte Carlo methods are the proper tools to apply.
Good luck and Best Wishes.
Many other Monte Carlo simulation sites are also available on the Internet
I like and occasionally still use the Financial Engines product developed by Noble Laureate Bill Sharpe. It is mathematically a rigorous and superior Monte Carlo tool. Bill Sharpe has dedicated his work to improve the lot of us small independent investors.
One issue that I currently have with Financial Engines is that I access it through my Vanguard affiliation so when it recommends some portfolio modifications, that sponsored site tends to follow the Vanguard tradition of fewer holdings and Index-like elements. The financial linkage with Vanguard provides a potential incentive for biased recommendations and makes their proposed changes somewhat suspect. That’s just me speculating aloud without any substantial evidence of any bias.
You can gain access to the Financial Engines website by visiting Terry Savage at the following address:
http://terrysavage.com/By clicking on the Financial Engines box you can get a free one year subscription to that planning tool.
These Monte Carlo tools surely do not remove the uncertainty of future market returns, but at least you enter the arena better armed to deal with those uncertainties. What realistic returns you guesstimate from the marketplace will forever be a potent driver to any decision.
I hope this helps.