They believe everything should be written in stone with everything on the table. If you don't spell it out for them they will not feel confident in you. For example, in Germany people tend to want lengthy contracts, specific information, and signatures for authentication. A simple handshake and verbal agreement is not enough. Where as in Singapore, verbal agreements and integrity are all that is needed.
People have confidence and know honor and integrity is at stake if an agreement is broken.
Typically, countries that are confident have tight networks that have been united for years.