AP Photo/Richard Drew

The signals for a coming recession are now all flashing at the same time.

The Federal Reserve's first cut to interest rates since 2008 did not change the yield curve (the margin between short- and long-dated US Treasury yields).

The yield curve has inverted before every US recession for the past 50 years.

The yield gap between three-month and 10-year Treasury bonds slid further below zero.

The yield gap between two-year and 10-year Treasury bonds briefly shrank to 10 basis points, the narrowest margin in four months.

Choppy stocks also point to market uncertainty.

Real-world data shows a contraction in manufacturing.

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The Federal Reserve's first cut to interest rates since 2008 was intended to bolster the US economy. Instead, a key recession indicator stayed stuck, flashing red.

The yield curve, or the margin between short- and long-dated US Treasury yields, narrowed on Wednesday. The catalyst was Fed Chairman Jerome Powell's description of the central bank's 25-basis-point reduction as a "mid-cycle adjustment" intended to protect against "downside risks," dashing investors' hopes for a procession of cuts over the coming months.

The gap in yield between three-month and 10-year government bonds slid further below zero to hover at about -5.5 basis points. The measure — which shows how uncertain bond investors are about the short-term fate of the economy — has inverted before every US recession for the past 50 years, according to the Financial Times.

Meanwhile, the two-year Treasury yield rose to a two-month high, according to Bloomberg. As a result, the gap between the two-year and 10-year yields narrowed to as little as 10 basis points, its slimmest gap since late March, before widening again.

US stocks declined on the news, the European and Asian markets were mixed, and real-world survey data from manufacturers in Europe showed the economy was slowing. Put all those factors together — a rate cut not shifting the yield curve, stocks going nowhere, and lousy macro data — and you have all the warnings signs for a contraction, all flashing at once.

Equity investors may be worried that the rate cut was not deep enough to move yield curves. They pushed US stocks lower:

The S&P 500 fell by 1.09%, to 2,980.38.

fell by 1.09%, to 2,980.38. The Dow Jones Industrial Average fell by 1.23%, to 26,864.27.

fell by 1.23%, to 26,864.27. The Nasdaq Composite fell by 1.19% to 8,175.42.

In Asia and Europe, it was more mixed:

European stocks were broadly higher, with Germany's DAX up 0.4%.

were broadly higher, with Germany's DAX up 0.4%. Britain's FTSE 100 was up 0.2%

was up 0.2% The Euro Stoxx 50 was up 0.6%.

was up 0.6%. Asian stocks closed lower, with both China's Shanghai Composite and Hong Kong's Hang Seng down 0.8%.

"What a mess," Michael Every, the senior Asia-Pacific strategist at RaboResearch, said in a research note.

The Fed trimmed rates "despite starting the year planning further hikes, despite ultra-low unemployment, and despite their own general admission that everything is basically awesome," he said. "Yet we ended the day with stocks lower, the US yield curve viciously flattening, and the US dollar at a two-year high."

Out in the real world, the global economy gave every sign is was entering a contraction. The purchasing managers' index for manufacturers in Europe hit its lowest measure since December 2012 in July, according to IHS Markit.

Europe: It was the "sharpest recorded reduction in employment for over six years" across the eurozone, the research firm said.

It was the "sharpest recorded reduction in employment for over six years" across the eurozone, the research firm said. The UK: Manufacturing PMI stayed stuck at a 6-1/2-year low.

Manufacturing PMI stayed stuck at a 6-1/2-year low. Germany: The index hit at seven-year low. The downturn in that country was gathering pace, IHS Markit said.

Oxford Econometrics/IHS Markit

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