High trust isn't nearly as vague as you make it out to be, and basic etiquette is only correlated. There's lots of research in this area. Francis Fukayama publi

High trust isn't nearly as vague as you make it out to be, and basic etiquette is only correlated. There's lots of research in this area. Francis Fukayama published the influential book "Trust" in 1995. Some key highlights about what high trust is. 1. "The most important habits that make up cultures have little to do with how one eats one's food or combs one's hair, but with the ethical codes by which societies regular behavior". 2. "Among the cultural habits that consitute virtues ... some... in particular, reciprocal trust - emerge only in a social context". 3. "The social virtues, including honesty, reliability, cooperativeness, and a sense of duty to others ...". This is just the introduction to the ideas of trust in society and how it functions, it isn't a vague concept though.