There are hard requirements (like laws and such) and soft requirements, somewhat more mystical. If you want people to obey, make the requirements (or guidance) hard, which requires writing them down, and publish them on the web..
“China Put Investment Controls In Writing,” The Wall Street Journal, August 19, 2017 A1. Controls deal with overseas investment by Chinese companies and investors. Restricts investment overseas in property, hotels, entertainment, and sports teams. Allows investment in critical technologies.
Does your company operate based on unwritten guidelines?
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