Based on benefit-cost analysis, increased productivity and employment may have substantial economic benefits over several decades: $1,251 to the state as a whole for each $1 invested in the SDR social marketing campaign. $36 in benefits to the state government for each $1 invested.

Three of the best-known health messages are eating five portions a day of fruit and vegetables, getting 150 minutes of exercise a week and quitting smoking. But what evidence is there that these have worked?

Our work published this week analyses all 111 cases studies of behavioral techniques used by governments compiled by the OECD (Organisation for Economic Co-operation and Development). Our analysis demonstrates that none of the techniques used have scientific proven effectiveness.