Yield spreads as country-specific equity regime context

A flexible proxy for curve slope

A strict all-rising or all-falling definition of curve slope is often unusable. Outer maturities can break the pattern, and identical yields across all tenors are almost never observed. A yield spread, the long-maturity government yield minus the short-maturity government yield, is therefore used as a flexible numeric stand-in for overall curve slope.

Editorial reading: a humped curve, with depressed short and long yields and a distinctly higher intermediate sector, is one uncommon shape that can spoil a whole-curve slope label even when a two-maturity pair still has a clear sign.

How a positive or negative curve is labelled

The three-month/10-year government spread is formed by subtracting the three-month yield from the 10-year yield. A result above zero is labelled a positive curve and treated as upward-sloping even when the far wings of the curve are imperfect. A result below zero is labelled a negative curve and treated as inverted even when not every maturity is falling.

A five-country core maturity pair

The five-country review used official central-bank yields for the United States, the United Kingdom, Germany, Canada, and Australia. The core maturity pair was the one-year and 10-year yields in the first three markets. Canada and Australia used the two-year and 10-year pair because one-year official yields were unpublished.

Local lags in the United States, Canada, and Germany

In the United States, the one-year/10-year spread stayed negative for multi-year stretches in the late 1960s, the 1970s, and the early 1980s. It turned negative again in 1989 before a 1990 equity pullback, fell close to -0.5% in spring 2000, and became negative again in early 2006.

Canada's two-year/10-year spread was already negative in 2007, yet the local equity index printed a new high in 2008 before declining. That gap was treated as a long and commodity-linked lag between a curve signal and the equity response.

In Germany, the one-year/10-year spread moved below 0.5 in 2000 and 2007. Those flattenings coincided with major equity downturns in a market where a fully negative curve was hard to form.

The flat-curve band as a substitute

Across the five countries, historical readings between 0 and 0.5 on the one-year/10-year or two-year/10-year spread were treated as a flat-curve band. A flat curve was described as able to stand in for a negative curve when inversion is scarce. That flattening substitute is a near-zero warning proxy in markets where a fully negative curve rarely forms.

Australia's two-year/10-year spread hovered near zero through 2005 and 2006 and only later turned negative. The equity index remained above its 200-day simple moving average for much of mid-2003 to mid-2007, so flattening alone was not treated as an entry or exit timer.

An indirect link, not a timing rule

From early 1985 into early 1993 the United Kingdom one-year/10-year spread was mostly negative while the local equity index advanced. The 1990-92 recession also combined a negative spread with a rising equity market. The curve-equity link was therefore treated as indirect and filtered through how stocks react to each expansion or contraction.

After short-term policy rates were held near zero, the lack of an inverted curve was judged insufficient to rule out recession. A relatively flat curve was still viewed as compatible with a serious long-horizon equity decline. Curve analysis was restricted to a regime gauge: a long-horizon environmental reading of expected expansion or contraction, not a standalone entry or exit trigger.