Longer-term research into anti-poverty interventions is rare, but it exists for cash transfers. A 2013 study in Uganda found that people who received cash enjoyed a 49 percent earnings boost after two years, and a 41 percent increase after four years, compared to people who hadn't gotten a transfer. Another study in Sri Lanka found rates of return averaging 80 percent after five years. In Uganda, not only were the cash recipients better off, but their number of hours worked and labor productivity actually increased.