The patient is experiencing Depression she is isolating herself.
C. associations of caravan merchants
Silk animals guns are yes. also maybe paper. others are no
Electronic commerce activities
Filial piety is a Chinese concept (respect for elders) so I wonder whether you mean in China, but I'll answer generally:
Respect for those who have been there before us, and learning can give us invaluable information about what has worked in the past and what hasn't, which is a good input into a good government. Also respect for elders is also a good basis for a harmonious society.