The economy is healing
We know the US economy has turned the corner. At some point, activity will be strong enough that the Fed will begin to raise short-term interest rates from their intensive-care-unit level of today. (Yes, the Fed has already begun to raise the discount rate, but this has been to force the major banks back into the commercial paper market instead of dealing solely with the government.)
what happens when the fed funds rate rises?
Even though the initial move may be months off, when is less important than how high the rate is likely to go and the effect the move will have on stocks and bonds. It’s not too soon to begin thinking about any of this.
two parts to this post
–The first will be what financial theory, such as it is, says about what should happen.
–The second will be an examination of the historical record of fed funds rate increases over the past twenty-five years.
Theory
fed funds rate behavior
One of the Fed’s jobs is to help carry out our highest-level national economic objective: maximum sustainable growth with low and stable inflation. “low and stable” means nothing much higher than 2%.
This gives us our first benchmark. Under normal conditions the fed funds rate, the price of overnight interbank deposits, will be slightly positive in real terms–about .5%-1.0% higher than the target inflation rate.
If the economy is running too hot, the Fed temporarily raises the rate, both to telegraph its concern and to raise the cost of borrowing, thus slowing the economy back down. When the economy is down in the dumps, on the other hand, the Fed drops the rate below inflation to try to pep activity back up.
Today, the rate is at about .25%, meaning the economy has been in a train wreck and is barely breathing.
Where is normal, then? Assuming inflation is under control, that is, 2% or less (and I think it is), the fed funds rate should be somewhere around 2.5%-3.0%. That means that one the Fed starts upping the rate, it won’t stop until it has tacked on 200 basis points, and possibly as many as 250.
Long rates won’t rise by as much, since this isn’t bond investors’ first rodeo and thus to some degree have already priced in some of the short-term interest rise. The extent of the yield curve flattening (meaning a smaller rise in long rates than in short) remains to be seen, but the ten- and thirty-year bond yields could easily rise by 100 bp.
the effect on stocks
Strictly speaking, there is no independent demand either for stocks or for bonds. This is because, to a great extent, the two asset classes are substitutes for one another. There is demand for the more general class of long-lived investment securities, which includes both stocks and bonds.
Why is this distinction important? If stocks and bonds are more or less substitutes, then anything that changes the price of bonds also tends to change, in the same direction, the price of stocks, and vice versa.
As interest rates go up, the price of bonds goes down. So rising interest rates should exert downward pressure on stocks as well.
For government bonds, that’s the end of the story. Not so for stocks, however.
The Fed only raises interest rates when economic activity–and thus corporate profits–are expanding as well. Rising profits tend to put upward pressure on stock prices, offsetting part or all of the negative force of rising interest rates. One can at least imagine circumstances where interest rates are rising slowly enough, or profits are growing fast enough, that stock prices are either stable or have a rising bias.
bond-stock equilibrium
One can also look at what the equilibrium relationship between stocks and bonds should be. This is usually done by comparing the interest yield on government bonds with the earnings yield on stocks. The earnings yield is typically calculated as the annual earnings per share of an index like the S&P 500 divided by the price of the index. It’s the inverse of the PE ratio.
If we assume that the 2010 earnings per share for the S&P 500 will be 85 and the index level is a bit below 1200, then the earnings yield is about 7.0%, which equates to a price earnings ratio of 1/.07, or 14.
Let’s say that as a result of the rise in fed funds to 2.75%, the ten-year bond yield increases to 5.0%.
The “right” proportion between a unit of yield in the bond market and in the stock market is a function of investor preferences and changes as they do.
If investors were indifferent to whether the earnings came from stocks or bonds (a big if, but more or less the relationship that has prevailed over the past twenty years), equilibrium would occur when the interest yield and the earnings yield were equal. A 5% long bond would imply a 20 times price earnings ratio (a 5% earnings yield) on the stock market.
Whatever the exact right number for today’s world may be, one can observe that a unit of earnings is available today much more cheaply than has historically been the case in the stock market vs. the bond market.
To sum up: increasing earnings give stocks some defensive power against rising fed funds and long-bond interest rates. Also, relative to one another, stocks are priced much more cheaply than government bonds–again arguably giving them some protection against rising rates/lower bond prices.
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