The economy is flashing a worrying signal that hasn't been seen since right before the 2008 crisis

• The US economy is flashing a worrying signal about the health of the consumer.
• The gap between growth of GDP and gross domestic income hasn't been this large since 2007, Macquarie said.
• "All this doesn't augur well for consumer spending going forward."

The US economy could be in worse shape than previously thought. That's evidenced by a worrying indicator, which hasn't flashed a warning this loud since right before the 2008 recession, according to Macquarie strategists.

The asset manager pointed to the US's monster GDP growth over the third quarter, with the economy expanding at a revised clip of 5.2%.