Valuing the impact of self-rated health and instrumental support on life satisfaction among the chinese population

BACKGROUND: Research has highlighted that satisfaction in health, and instrumental support (IS) are key areas of life affecting an individual’s wellbeing. Many social and public health initiatives use these two intervention mechanisms to improve individual’s wellbeing. For the purpose of cost-benefit assessment, there has been growing interest in expressing these intervention effects in economic terms. However, only a handful of studies have ever estimated these effects in economic terms, none of which examined them in a Chinese context. The aim of this study is to extend this line of valuation work to the Chinese population, estimating the implicit willingness-to-pays on the effects of improving individuals’ self-rated health (SRH) status and IS on their life satisfaction (LS). METHODS: Using data from a two-wave representative panel survey in Hong Kong (n = 1,109), this study conducted a cross-lagged analysis with a structural equation modelling technique to examine the causal effects of SRH and IS on LS. The use of this cross-lagged approach was an effort to minimise the endogeneity problem. Then, substituting the respective estimates to the formulae of compensating surplus, the marginal rate of substitution of SRH and IS with respect to individual’s equivalised monthly household income (HI) were estimated and were then expressed as the implicit willingness-to-pays on the effect of improving individuals’ SRH and IS on their LS. RESULTS: The cross-lagged analysis ascertained the causal effects of SRH (β = 0.074, 95% Confidence Interval: 0.021, 0.127) and IS (β = 0.107, 95% Confidence Interval: 0.042, 0.171) on individuals’ satisfaction with life. Translating into the concept of compensating surplus, the implicit monetary values of improving the sample’s SRH from “poor health” to “excellent health” and their perceived IS from “little support” to “a lot of support” are equivalent to an increase in their equivalised monthly HI by US$1,536 and US$1,523 respectively. CONCLUSIONS: This study is the first to derive the implicit monetary values of SRH and IS on individual’s LS in a predominantly Chinese society, and it has implications for the cost-benefit assessment in wellbeing initiatives within the population. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12889-022-13626-7.