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The “Natural” Interest Rate and Secular Stagnation: Loanable Funds Macro Models Don't Fit Today’s Institutions or Data

By Lance Taylor

Can America recover ideal rates of growth through interest-rate policies? This important analysis suggests that most economists misunderstand the issue. Updating Keynes, the analysis suggests that fiscal stimulus, labor union bargaining power, and more progressive income taxes are needed to support growth. (The article includes some algebra, which some readers may choose to skip.)

The main points of this paper are that loanable-funds macroeconomic models with their “natural” interest rate do not fit with modern institutions and data. Before getting into the numbers, it makes sense to describe the models and how to think about macroeconomics in the first place.

Today’s “New Keynesian” orthodoxy says that short- to medium-run performance is determined by interest-sensitive “loanable funds.” Unimpeded interest-rate adjustment should support robust macroeconomic equilibrium. Examples of this thinking include the (visibly nonexisting) “zero lower bound” on rates, which allegedly holds down saving and contributes to secular stagnation, the global “savings glut” keeping market rates near zero, and the “dynamic stochastic general equilibrium” (DSGE) models beloved by freshwater economists and central banks in which investment is determined by saving as a function of financial return.

Loanable-funds doctrine dates back to the early nineteenth century and was forcefully restated by the Swedish economist Knut Wicksell around the turn of the twentieth (with implications for inflation not pursued here). It was repudiated in 1936 by John Maynard Keynes in his General Theory. Before that he was merely a leading post-Wicksellian rather than the greatest economist of his and later times.

Macroeconomic models are built around assumptions about behavior imposed upon accounting relationships such as value of output (or demand) equals cost of output (which generates income), and value of assets in a balance sheet equals value of liabilities plus net worth. Keynes said that changes in income dominate in making sure that the first accounting balance is satisfied. He switched Wicksell’s assumptions about macro causality—or, in the jargon, the “closure” of the model—to fit his understanding of the system. New Keynesian economists reswitch the closure back to Wicksell.

Institutions have evolved since Wicksell and Keynes were writing—the welfare state materialized and international trade expanded. Both thought, correctly for their times, that most saving comes from households and that most investment is done by business. Unlike Keynes, Wicksell argued that “the” interest rate as opposed to the level of output adjusts to ensure macro balance. If potential investment falls short of saving, then, maybe with some help from inflation and the central bank, the rate will decrease. Households will save less (and possibly also run up debt to buy into a financial bubble as prior to 2007), and firms seek to invest more. The supply of loanable funds will go down and demand up, until the two flows equalize with the interest rate at its “natural” level.

In New Keynesian thinking, demand for investment can be so weak and the desire to save so strong that the natural rate lies below zero. The “distortion” imposed by the zero lower bound short-circuits the adjustment process, leading to calls for central banks to raise their inflation targets to reduce the “real” interest rate (nominal rate minus inflation). More straightforward interventions—such as restoring American labor’s bargaining power so that rising wages can push up prices from the side of costs, expansionary fiscal policy, or redistributing from the top 1 percent to households in the bottom half of the income size distribution whose saving rates are negative—are apparently impossible for “political” reasons.

Read the rest here.


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