Yield Curve Steepening vs Flattening: Bull & Bear

Eco3min — Yield Curve Steepening and Flattening: Bull and Bear, Explained

The US Treasury yield curve changes shape in two basic ways: it steepens (the gap between long and short yields widens) or flattens (the gap narrows). Each move can happen while yields are broadly falling — a “bull” move, where bond prices rise — or broadly rising — a “bear” move, where prices fall. That gives four combinations: the bull and bear steepeners and flatteners defined below.

The distinction is not cosmetic. Which end of the curve drives the move — the policy-sensitive front end or the growth- and inflation-sensitive long end — is exactly what each label encodes, and it is why the four shapes tend to show up in such different macro contexts.

Steepening — definition

Steepening — Yield curve steepening is a widening of the gap between long-term and short-term Treasury yields — the curve gets steeper as long yields rise relative to short yields, or short yields fall relative to long.

How it's read: Measured by a spread such as 10-year minus 2-year (or 10y minus 3-month): a rising spread signals steepening. It can come from the short end (short yields falling) or the long end (long yields rising).

Why it matters: Steepening has often accompanied the early stages of an easing cycle or a pickup in growth and inflation expectations; the direction of rates that drives it — falling or rising — distinguishes a “bull” steepener from a “bear” steepener.

Go deeper: Monetary policy & rates pillar · Yield curve dataset (2s10s) · 2s10s inversion history

For the historical record of these moves, the 2s10s yield curve dataset tracks the 10-year minus 2-year spread back to 1976. On how a sustained flattening into inversion has related to recessions, see the credit-channel mechanism.

Last updated — 6 October 2026

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