by Calculated Risk on 11/11/2005 01:08:00 PM

Senior economist Kevin J. Lansing of the San Francisco Federal Reserve Bank writes: Spendthrift Nation

In September 2005, the personal saving rate out of disposable income was negative for the fourth consecutive month. A negative saving rate means that U.S. consumers are spending more than 100% of their monthly after-tax income. The recent data are part of a trend of declining personal saving rates observed for two decades. During the 1980s, the personal saving rate averaged 9.0%. During the 1990s, the personal saving rate averaged 5.2%. Since 2000, the personal saving rate has averaged only 1.9%.

This Economic Letter discusses some of the factors that appear to be driving the secular decline in the personal saving rate. These factors include rapid increases in stock market and residential property wealth, which households apparently view as a substitute for the quaint practice of putting aside money each month from their paychecks. Rapidly rising stock and house prices, fueled by an accommodative environment of low interest rates and a proliferation of "exotic" mortgage products (loans with little or no down payment, minimal documentation of income, and payments for interest-only or less) have sustained a boom in household spending and provided collateral for record-setting levels of household debt relative to income.

Going forward, the possibility of cooling asset markets and rising borrowing costs may cause the personal saving rate to revert to levels which are more in line with historical averages. While such a development would act as near-term drag on household spending and GDP growth, an increase in domestic saving would help correct the large imbalance that now exists in the U.S. current account (the combined balances of the international trade account, net foreign income, and unilateral transfers).

Dr. Lansing presents a model of wealth effects on savings and compares the model to actual data:

Figure 4 plots the U.S. personal saving rate together with the fitted saving rate from the model. The simple behavioral model can account for 89% of the variance in the U.S. personal saving rate from 1960:Q1 to 2005:Q1. A slightly improved fit can be obtained by adding a time trend to the regression equation. A time trend is a proxy for ongoing credit industry innovations (growth of subprime lending, home equity loans, exotic mortgages, etc.) which have expanded consumer access to borrowed money and reduced the need for precautionary saving.

Figure 4 suggests that the decades-long decline in the U.S. personal saving rate is largely a behavioral response to long-lived bull markets in stocks and housing together with falling nominal interest rates over the same period. Since 2000, the rate of residential property appreciation has been more than double the growth rate of personal disposable income. In many areas of the country, the ratio of house prices to rents (a valuation measure analogous to the price-earnings ratio for stocks) is at an all-time high, raising concerns about a housing bubble. Reminiscent of the widespread margin purchases by unsophisticated investors during the stock market mania of the late-1990s, today's housing market is characterized by an influx of new buyers, record transaction volume, and a growing number of property acquisitions financed almost entirely with borrowed money.

According to the model, the personal saving rate would be expected to halt its decline and start moving up if stock or housing markets sagged, or if long-term interest rates jumped, say, due to inflation fears. An increase in the personal saving rate would slow the growth of household spending which, in turn, would have negative implications for the derived demands of business investment, inventory accumulation, and business hiring. But, on a positive note, a pickup in saving activity in the household sector would help offset the ongoing deficit spending in the government sector. A rise in net domestic saving would reduce the U.S. economy's reliance on foreign capital inflows as a source of saving. At present, the U.S. current account deficit stands at more than 6% of GDP, implying that the U.S. economy must draw in around $3 billion per day from foreign investors to finance domestic spending.

Hat tip to Joshua for sending me the article!