Supporters of universal basic income have called for a trial in Wales to include everyone living in a test area.
BBC News
UBI pays everyone a fixed sum, regardless of their circumstances.
The Welsh government has said its small trial could involve people leaving the care system.
In an open letter to the first minister, signatories, including the future generations commissioner, said it needed to cover geographical areas for it to be an effective test.
Trials have taken place in Finland and California, with a 12-year project running in Kenya.
But in their letter, supporters said the welfare system was “not fit for purpose”.
They said specific geographical areas, such as council wards, should be used alongside the proposals for those leaving care.
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