The final reading for real GDP growth in Q1 was revised upward to a 2.1 percent rate from a prior estimate of 1.6 percent, but the underlying details show a weaker mix. The stronger headline reflected a large upward revision to net exports, along with smaller upward adjustments to inventories and business investment, which were enough to offset a substantial downward revision to personal consumption for services. Looking at core GDP—which includes consumer spending, business fixed investment, and home building while excluding the more volatile categories such as government purchases, inventories, and trade—core GDP grew at a 1.7 percent annual rate in Q1, below the prior estimate of 2.4 percent, marking the lowest growth rate fo...