In Simple Words
Think of an employer giving workers a free daily gourmet lunch. Workers initially exert extra effort out of appreciation, but over time the gratitude fades and effort returns to baseline unless their fundamental job skills were permanently upgraded.
Bengaluru workers in the training trial
- During the year of training
- Small, uncertain productivity gain
- After training ended
- 10.8 percentage points higher efficiency
Each period compares training with control workers. Efficiency is output relative to task target. Follow-up lasted eight months; this does not rule out every reciprocity effect.
See source →Research question
Productivity gains from employer-provided worker amenities are often attributed to short-lived gift-exchange reciprocity—where workers temporarily increase effort out of gratitude—rather than permanent human capital acquisition.
Participants
N = 2,703 female garment workers observed across 112 production lines over 20 months in Bengaluru, India.
Study Design
Longitudinal two-stage RCT tracking daily worker efficiency during the 12-month training period (when 1 hour per week of paid time was granted) and 8 months post-completion.
Results
Productivity treatment effects were small and statistically insignificant during the 12-month training phase (+3.0 percentage points, p > 0.10) but grew significantly post-completion (+10.8 percentage points, p < 0.05) and persisted for 8 months, disproving gift-exchange reciprocity and confirming genuine skill accumulation.
Takeaway
Evaluate workplace training efficacy using post-program longitudinal tracking rather than during-program performance to distinguish structural skill accumulation from temporary gift-exchange reciprocity.
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.
- Longitudinal study
A study that checks the same group of people at different times. This lets researchers examine how things change over time.
ExampleResearchers ask the same workers about their wellbeing at the start, after three months and after six months.
NICE · Longitudinal study ↗Read more about longitudinal study →- 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 →