In Simple Words
Think of a store that gives a $250 monthly discount coupon, but reduces the coupon value by 24 cents for every dollar spent on groceries using earned wages. If a customer works to earn extra money, nearly a quarter of their earnings is canceled out by a loss in coupon value. Because working more reduces the net reward, the customer chooses to work fewer hours in the short term.
Young jobseekers in 82 French youth centers
- Standard career guidance
- Comparison group
- Guidance plus cash offer
- Estimated 3 percentage points less full-time employment
Survey estimate for the first six months. Tapering was not tested separately. Response rates differed by group; missing answers could explain the difference. No clear year-two effect.
See source →Research question
Phasing out social benefit payments as earned income increases creates an implicit marginal tax on labor earnings, reducing short-term work incentives. Jobseekers receiving temporary financial assistance face reduced net monetary gains from taking full-time work, leading to temporary reductions in employment supply.
Participants
N = 5,498 young jobseekers aged 18–22 across 82 Job Youth Centers in France.
Study Design
Randomized controlled trial (RCT) with monthly retrospective employment tracking over 24 months via 12-month midline (N = 3,413) and 24-month endline (N = 2,310) surveys.
Results
Monthly cash benefits were reduced linearly against labor earnings up to the minimum wage (€1,050/month), creating an implicit tax rate of 24%. During the first six months, full-time employment declined significantly by 3 percentage points (ITT -0.18 months of total employment from a control mean of 2.41 months, p < 0.05; TOT -0.21 months, p < 0.01), though this negative employment effect disappeared by the second year.
Takeaway
Structure benefit taper rules with lower implicit tax rates or lump-sum retention bonuses so that entering full-time employment yields immediate, un-penalized net income gains.
Source and citation
See source →Read alongside the research
Plain-English glossary
Original explanations, informed by the references below. Examples are illustrations, not data from the studies above. The research text stays unchanged.
- Percentage points
The difference between two percentages.
ExampleA rise from 40% to 50% is 10 percentage points. Relative to the starting value, that is a 25% increase.
Office for National Statistics · Percentages ↗Read more about percentage points →- Randomized controlled trial
A study that uses chance, like drawing lots, to decide who receives each option being compared. Researchers compare the groups’ outcomes to estimate the effect of those options.
ExampleA lottery assigns volunteers to a training programme or a comparison group. Researchers then compare their outcomes.
GET-IT glossary · Randomized study ↗Read more about randomized controlled trial →