Long time single-payer advocate Kay Tillow wrote a piece last weekend taking issue with my willingness to invest a portion of the Social Security trust fund in the stock market. This is a response to the main points.

First, I should clarify what is at issue. I am certainly not supporting in any way changing or reducing the guaranteed benefit from Social Security. I have spent much of the last 20 years fighting the people who want to cut benefits and/or replace Social Security with individual accounts. I am not switching course on my opposition to this.

Second, I did not envision the trust fund investing in individual stocks as Ms. Tillow implied. I assume that any investment would be in the form of a broad index fund like the S&P 500 or the Wilshire 5000. I don’t know of anyone who advocates having the fund invest in individual stocks.

This also addresses the issue of fees charged by Wall Street investment fund managers. The fees for investing a fund of this size in an index fund should be on the order of 1-2 basis points (0.01-0.02 percent). We have a precedent for this; the Thrift Savings Plan for federal employees contracts the management of its fund for a fee in this range. There would be no reason to expect higher fees for the Social Security trust fund.

In terms of the risk of investing in the market, it is hard for me to see any serious risk, precisely because the stock market has plunged from its bubble-inflated levels. I had argued against investing in the stock market in the late 90s, when this idea had become very fashionable in Washington, because the stock market was in a bubble.

Relative to trend earnings, prices are now at less than half of their bubble peaks. Given this plunge in price to earnings ratios, it is very hard to draw a plausible economic scenario in which the return on stocks over the next 10-15 years will not exceed the return on the government bonds that the fund now holds.

It is also important to remember in this context that the trust fund is not like an individual; it will never be forced to sell off its holdings on any given day. If the market is depressed for a prolonged period of time it would be possible to defer sales indefinitely.

There are still issues that should be discussed if the trust fund were to go the route of investing in the stock market. For example, it would be important to have some assurance that ownership of a stake in the market would not be an argument against enforcing the law against big corporations. In other words, we would want to be sure that if Social Security had a 5 percent stake in BP that it would not be used as an argument against holding BP accountable for its spill.

The government already shares risk with private corporations through the corporate income tax, so stock ownership does not create a new situation in this respect. Still it would be desirable to get a commitment from all sides that the trust fund’s indirect ownership of stock should not be a factor in policy decisions.

Finally, it is worth noting this debate is likely moot at this point. In the past, when investing the trust fund was considered, it was in the context of investing a portion of the annual surplus of tax revenues over benefits. At the time, the program was running large surpluses and was projected to continue to run surpluses for two decades.

This is no longer the case. Due to the downturn and the aging of the workforce, the annual surplus of taxes over benefits is now near zero and is only projected to be at all positive for a 6-7 more years into the future. This means that unless the fund uses interest from the bonds it now holds to invest in the market, or sells off some of these bonds, it would have relatively little to invest from this point forward. Since few people, if anyone, has explicitly advocated going this route for investing funds in the stock market, it is unlikely that the idea will advance very far.