This probably won't surprise you but "happiness efficiency increases with better working conditions, social support, access to natural capital, and less materialistic attitudes." https://www.nature.com/articles/s44458-026-00059-1
Happiness efficiency rises with better working conditions, social support and access to nature - Communications Sustainability

Work-life balance, natural surroundings, social ties and non-materialistic mindsets raise how well people turn resources into well-being, according to a study of Japanese survey data measuring happiness efficiency.

Nature