Economics Glossary: Deflation, Disinflation, Stagflation, Yield

Macro conditions set the regime every asset trades in. Misreading these terms leads to wrong-side positioning in equities, bonds, and commodities.

Deflation

A sustained decline in the general price level — negative inflation. CPI prints below 0% for multiple quarters. Causes: debt deleveraging, monetary contraction, or productivity surges.

Deflation is bullish for cash and long-duration Treasuries, bearish for equities (margins compress) and most commodities. Japan 1995–2013 is the textbook case: Nikkei lost 60% of value in the first decade of deflation.

The Fed treats deflation as the primary threat and will cut to zero and QE aggressively; long-duration bonds typically rally 15–25% in the first 6 months of a deflation scare.

Disinflation

A slowdown in the rate of inflation — prices still rising, but more slowly. CPI drops from 8% to 4%, not negative. Disinflation is the most equity-friendly regime: falling inflation lets the Fed pause or cut, multiples expand while earnings hold.

The 2023 disinflation from 6% to 3% drove a 20%+ S&P 500 rally. The trade: long equities, short duration long-bonds (yields fall but curve steepens), underweight gold.

Stagflation

Low growth + high inflation + rising unemployment. Worst regime for traditional 60/40: equities fall on weak earnings, bonds fall on inflation, only commodities and real assets rise.

1973–1974 is the template: S&P 500 fell 48% in two years while gold tripled. Identification: CPI above 4% while GDP growth below 1% and unemployment rising for 3+ months.

Stagflation playbook: overweight commodities (gold, oil, agriculture), short long-duration bonds, defensive equity sectors (energy, staples). Avoid growth stocks; their multiples collapse with rising real yields.

Yield

Return on a bond, expressed annually. Three sub-terms matter:

• Nominal yield: coupon / price. A 5% coupon bond at par = 5% nominal.
• Current yield: annual coupon / current market price.
• Yield to maturity (YTM): total annualized return if held to maturity, accounting for price, coupon, and time. The headline number in financial media.

Yield moves inversely to price. A 10-year Treasury moving from 4% to 3% means the bond price rose ~8.5%.

Yield curve signals

• Inverted 2s10s (2y yield > 10y): recession warning, has preceded every US recession since 1970 by 6–18 months.
• Steepening after inversion: recession often arrives 0–6 months after the curve re-steepens.

Trade the regime: deflation = long duration; disinflation = long equities; stagflation = long commodities, short bonds. Getting the regime right matters more than stock picking.