The only difference the article mentions is that the experimental subjects were chosen among people getting unemployment benefits. What this suggests is that if

The only difference the article mentions is that the experimental subjects were chosen among people getting unemployment benefits. What this suggests is that if you're on unemployment to begin with, differential incentives do not have a detectable impact on whether you'll find a job - that's all. It's saying that incentives aren't everything, at least on a 2-years-out scale.