I have first hand experience with this, although in Australia. My first job was working for a IT development and solutions shop (this is over 17 years ago) where they won the bid to rollout the internet and network gateways across a large number of Australian government schools. We were doing similar work for private school at the same time, and the process for the public and private school could not be more differen…
You get similar stuff at private companies too, though few private companies are large enough for corruption like that to be able to reach the same scale without getting too big to go unnoticed by auditors for long enough. The number of times I've had potential supplier hint at extra perks or "return favours" is fairly high, and I've not even been in positions of very substantial purchasing power. It's often not even…
One typical example I had is not receiving a replacement laptop when working for a bank because replacement hw is too expensive, so I could not work for essentially one month. My consulting rate would have paid for a top of the line laptop in 2 days. But those are of course two different cost centers, so it will never surface.