> China's pretty corrupt politically but the social trust is quite high, the highest outside of northern europe as far as I can tell

There are a few reasons for that that I can imagine:

- China is one of very few autocracies that has managed to significantly improve the standard of living of most of its population.

- The public trials and (sometimes) executions of allegedly corrupt individuals might help improve the perception of corruption.

- The same harsh penalties mentioned above might influence people to declare a higher level of social trust than they actually have, even if the poll is supposedly "confidential" and "only for scientific purposes".

>The same harsh penalties mentioned above might influence people to declare a higher level of social trust than they actually have.

This 100%.

Political imprisonment and reeducation camps are antithetical to any definition of a high trust society that I would subscribe to.

China was getting better for a long time. XI is changing that. Change is slow though and he is not rushing corruption though it seems to be increasing. He has purged some corrupt people as well making things slightly better in the short term - but he values loyalty over competence and so his short term changes are for less corruption but long term increase it.

That is China is a complex country and books (which are not written and many cannot be for decades yet) are needed to understand this, not a short comment box. [This applies to every other country anyone here mentions]

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Social trust is high because there are pretty heavy handed control measures over the population with havy costs. Thats more of a fear based society than trust. Government can giveth and government can taketh.

1. Fear of a capricious state can cause survival-motivated compliance which can appear as "trust" in coarse measurements. Meaning, you simply do fewer of those things that would provide opportunities for distrust in contexts where that could happen.

2. In a relatively severe, but consistent regime, the high penalties for violating trust in everyday cases (crime) act as a deterrent.

3. Fear may cause people to be selective and mindful about their social associations based on stronger proofs of trustworthiness. You might tell a Hitler joke to someone you have used more energy/caution to "vet", but avoid being too casual in environments of undetermined trustworthiness.