Skip to content

Dollar cost averaging: making hay while the sun shines or doubling down?

April 23, 2010

Over at Scientific Clearing House, Carson posted a pretty proof of the how dollar cost averaging is an optimal investment strategy.  Unfortunately, I think the conditions for this optimization aren’t practical because they are far too optimistic about one’s ability to choose to invest in appreciating assets.

In a long winded comment, I take delight in making the following perverse equivalence between an honest work-ethic idiom and foolish gambling practice,

Under these optimistic assumptions, DCA [dollar cost averaging] is equivalent to the idiom: make hay while the sun shines. Downward price fluctuations are viewed as opportunities to use the same resources to make even more of a good investment. Under less certainty, this is what gamblers call doubling down–when you are loosing, bet more so when you win, you make up your previous losses.

I have advocated DCA as a reasonable investment strategy to friends of mine, but I am increasingly skeptical about the assumptions.  It is starting to seem more like doubling down and less like making hay.

Advertisements
No comments yet

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: