How We Got 2.8% GDP Growth In Q3

As expected, the Bureau of Economic Analysis revised down its estimate of Q3 GDP growth. BEA’s second estimate pegs growth at a 2.8% annual pace in Q3, down from 3.5% in the advance estimate.

The revision was driven by three main factors: consumer spending and business investment in structures were weaker than previously estimated, while imports were stronger.

As usual, I think a useful way to summarize the drivers of Q3 growth is to look at the contributions:

In principle, the solid growth in consumer spending and housing investment should be promising signs, given their previous weakness. However, both were boosted by temporary stimulus efforts. Cash-for-clunkers lifted consumer auto sales in Q3, for example, but we should expect some payback in Q4. Meanwhile, the tax credit for new home buyers helped housing investment record its first increase since late 2005, but some of that may have come at the expense of future housing investment (because potential home owners accelerated purchases when they thought the credit was going to expire; it’s since been extended and broadened).

Note: If the idea of contributions to GDP growth is new to you, here’s a quick primer on how to understand these figures. Consumer spending makes up about 70% of the economy. Consumer spending rose at a 2.9% pace in the third quarter. Putting those figures together, we say that consumer spending contributed about 2.1 percentage points (70% x 2.9%, allowing for some rounding) to third quarter growth.

About Donald Marron 294 Articles

Donald Marron is an economist in the Washington, DC area. He currently speaks, writes, and consults about economic, budget, and financial issues.

From 2002 to early 2009, he served in various senior positions in the White House and Congress including: * Member of the President’s Council of Economic Advisers (CEA) * Acting Director of the Congressional Budget Office (CBO) * Executive Director of Congress’s Joint Economic Committee (JEC)

Before his government service, Donald had a varied career as a professor, consultant, and entrepreneur. In the mid-1990s, he taught economics and finance at the University of Chicago Graduate School of Business. He then spent about a year-and-a-half managing large antitrust cases (e.g., Pepsi vs. Coke) at Charles River Associates in Washington, DC. After that, he took the plunge into the world of new ventures, serving as Chief Financial Officer of a health care software start-up in Austin, TX. After that fascinating experience, he started his career in public service.

Donald received his Ph.D. in Economics from the Massachusetts Institute of Technology and his B.A. in Mathematics a couple miles down the road at Harvard.

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