5 reasons why people don't share

Found this at the Society for HRM site: Five Reasons People Don't Share by Pamela Babcock:
1. People believe K. is power.
2. People are insecure about the value of their K.
3. People don't trust each other.
4. Employees are afraid of negative consequences.
5. People work for other people who don't tell what they know.
Seemed a good useful summary to me so thought I'd share it :))