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Taming the Risk of Markets

You aren't smarter than the market. It really is that simple.

A few years ago, in October 2008 right after the market "crash", I did a post on confusing volatility and risk. Yesterday an article on CNN Money in their "Ask the Expert" column made it clear that confusion about the risk of volatility extends to the media who provide advice on personal finances.

You can read the column for details. But the short version is that someone approaching retirement asked for advice on changing the balance between different assets in their retirement accounts to reduce its overall risk. Specifically they wanted to know "Should we rebalance all at once or slowly over time?"

The columnist response was all at once. His argument was "by transitioning to the new asset mix over time, you're really postponing (or perhaps more accurately, undermining) your decision to re-set the risk-reward balance in your portfolio."

This is just plain bad advice. The market can go up or down several percentage points in a day. The risk from that volatility exists only when you make a transaction. The risk is that you happen to sell when prices are temporarily at the bottom of a cycle or buy when they are temporarily at the top. The more money you move at once, the bigger the impact of luck (good or bad).

If you want to REDUCE your risk the dumbest thing you can do is to move a lot of money all at once. Whether you like it or not, you are timing the market. The only difference is that you are doing it with one random roll of the dice instead of some anticipation of the market direction. Averaging those moves over the course of the year won't eliminate the risk the market will be down or up over a longer cycle. But it will reduce the risk from day to day, week to week and month to month fluctuations. And given current market volataility, those risks are substantial.

Some people will argue that if the market goes back up again, you will have restored whatever losses you had. But that also misunderstands how volatility plays out. If you buy stock at a higher price, you get fewer shares. Regardless of what price you sell them at, you will get less for them in direct proportion to the higher price you paid.

I keep our personal finances in Quicken. I can follow the balance in our retirment accounts as the fluctuate from day-to-day. And occasionally I will joke to my wife that we made (or lost) some big sum of money. Since we have no intention of buying or selling, the reality is that those fluctuations are meaningless. And for accounts that we will not touch for another ten years, monthly and even annual changes don't mean much.

But once you go to buy or sell, those fluctuations can have a dramatic impact. Buy when the price is 5% higher than its average over the next twelve months and you have effectively lost 5% of the value. And that loss is permanent.

Put in different terms. If you gamble a large sum of money on the flip of a coin, there is a 50% chance you will lose it all. If you flip the coin twice, the chances of losing everything drop to 25%, if you flip three times they are 1 in 8 or 12.5% and flip once more and they are down to 6.25%. Of course your chances of winning every time also drop. But if your goal is to reduce risk, then the more times you flip, the less risk. Investments work the same way, the more times you gamble on market volatility the less likely you are to get badly burned.

I would note, I have not considered the cost of transactions here. If you are paying a fee every time you move money then you need to consider how much extra the over time strategy will cost.


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