Governor Gavin Newsom holds a mock-up check for the first 15 Californians to be awarded US$50,000 for doing their part in getting vaccinated against COVID at the California Lottery Headquarters in Sacramento. ZUMA Press, Inc./Alamy Stock Photo

COVID vaccines: we need to find out which incentives actually work

Randomised controlled trials are used for drug trials. They should be used to find out of incentives to get the jab work too.

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