I worked two jobs for a few months back in college once. I didn't have a compelling need to do it but I seemed able to manage it and I guess I just wanted the extra money. I'm proud to say I got straight A's that quarter in college. I honestly think having to work that much and go to school full time forced me to be a better student. With such little free time I had to manage my time better to get my school work done. When I had more free time I had more of a tendency to goof off more as there was ample time to fill and that just turned into more goofing off and procrastinating and homework didn't always get done when it should. What... what was I talking about? Oh... yes having two jobs. Some people do that and I'm assuming most people working two jobs do it because they need the money. But only a few people really work two jobs and the numbers have been dropping.
The BLS article Multiple jobholding over the past two decades has the data in graphic and table form. You can go to their site to see specific dates if you want details. But I've copied the graph from their site here so we can see the trend :
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The rate has been going down mostly for the past 20 years. The rate peaked at 6.8% in 1995 and was down to just 5% as of the end of 2013. Doesn't seem like the recession had any substantial impact on the trend either.