The latest GDP release from the BEA estimates that U.S.real GDP grew at 1.5% in the third quarter of 2015. This is just a mediocre growth rate but revisions to second quarter data have now increased the final growth estimate to a robust 3.9 percent.
Recall that inventory is part of investment expenditures in GDP. In the second quarter, private inventories fell by 1.44%. This drop was the biggest negative of the major pieces of GDP. In total, investment fell by about 1% in the third quarter. The table below shows how the four major pieces of GDP each contributed to third quarter growth.