A question of corruption.

What do we mean by financial or political corruption? We can all offer examples of what we consider to be corrupt behaviour but where do we draw the line? A corrupt police officer takes a backhander from a journalist but is that any more corrupt than running a private security firm? If we went to the doctor and they told us that we could only be treated for a considerable sum of money - would that be corruption or just private medicine? If the necessities of life can only be obtained by crossing the right person's palm with silver is that corruption or a wholly admirable entrepreneurial spirit? You can't smell sweet in a sewer.