Density and the same people and ideas AKA homogenity of the population.
Look at Japan and rural Western societies. High trust, but the trust is because they are all pretty much the same people, demographics, beliefs, etc. and the density makes it so they pretty much know each other.
Look at Japan and rural Western societies. High trust, but the trust is because they are all pretty much the same people, demographics, beliefs, etc. and the density makes it so they pretty much know each other.