The Fed could argue that the gap between current and full-employment GDP is larger than the 6.1% unemployment rate implies, owing to the large number of part-time workers who would prefer full-time employment and the sharp decline in the labor force participation rate. If the GDP gap is 4%, as a recent Congressional Budget Office estimate implied, the Taylor rule would indicate an optimal federal funds rate of about 1.25% (2 + 1.5 – 0.25 – 2), compared to the current rate of only 0.1%.