Contract awarding, nepotism & Co: What is allowed in networking?

The cases of corruption in Austria cast a bad light on networks, the transition to free-market economy seems to be seamless.

The cases of corruption in Austria cast a bad light on networks, the transition to free-market economy seems to be fluid. What is allowed in networking, where does the "give and take" end in good and when does it become too much of a favour, or even corruption?

Harald Katzmair about the difference between networks and corrupt entanglements.