Meredith Whitney has issued a stark warning about the US economy heading into the fourth quarter. Temporary tailwinds from the World Cup and government spending are fading, and signs point to a slowdown in consumer activity.

Whitney, known for predicting the 2008 financial crisis, notes that weekly credit card balances are growing more slowly compared to May, signaling decreased consumer momentum. Added strain comes from rising gasoline prices, which eat into disposable income especially for lower-income households. This divergence creates what Whitney calls a "tale of two economies": semiconductor firms and wealthy consumers are holding up well, while lower-income groups are tightening their belts.

Amid this split, Whitney expects the Federal Reserve to keep interest rates steady after its upcoming meeting, using firm language to maintain flexibility. Markets currently price in only a 33% chance of a rate hike, and she argues that any surprise increase wouldn’t necessarily boost Federal Reserve Chair Kevin Warsh's credibility.

Warsh’s recent move to set up five policy task forces suggests a cautious approach, allowing more time to analyze economic trends before changing rates. Whitney also points out that long-term borrowing costs are driven more by federal debt and fiscal policies than by the Fed’s actions, meaning mortgage rates and Treasury yields might stay high regardless.