Via Brad DeLong:  Max Sawicky, Obamacare Isn’t Causing an Increase in Part-Time Employment, In One Chart:

One of the more baffling messages in the current debate over the economy and “Obamacare” is the hue and cry over the trend in part-time employment. The fact is that since the end of the Great Recession, the trend in part-time employment has been down, not up. The black line in the chart below shows the share of part-time workers in the labor force. The light blue region shows the level of workers who are part-time due to economic reasons. The navy blue region show the level of workers who are part time due to “non-economic” reasons (health, child care responsibilities, etc.). The vertical bars denote recessions, from peak to trough.