This is so true and I wish economists and other social scientists would research that more. In general, we know many factors that decrease general level of tru

This is so true and I wish economists and other social scientists would research that more. In general, we know many factors that decrease general level of trust (sometimes called "social capital") in the society. This is sometimes tied to inequality. But we don't know many reliable factors of how to actually increase trust, yet we intuitively understand that it is very closely related to well-being. Heck, we don't even know how to reliably increase trust between individuals, for example in failing relationship. I think this is one of the biggest open problems in psychology and sociology.