A key indicator of fear about an economic downturn flashed red on Monday for the first time since 2006, fueling fears of a recession.

On Monday morning, the yield on the five-year Treasury note increased to 2.64% — higher than the yield on 30-year notes, which dropped to 2.60%. The “inversion,” as it’s known to investors, was short-lived, but the curve on the two notes remained flattened as of Monday afternoon, with the five-year yield sitting at 2.55% and the 30-year at 2.57%.

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