Basically.... when a new or vacant job is posted for bid 85% of eligible employees will sign it and only 10% will have any real intention of taking the job. Half of the people that signed it will talk at length to anyone and everyone that will listen about why they will take the job. Then afterwards they will talk to the same people about why they didn't take the job. Someone in management/HR will have to contact people that signed starting in seniority order and, depending on his large your building is, that can take a while.
EVENTUALLY the person that actually wanted the job will get the call and will start working in that position soon after all of the higher seniority power trippers have had their egos stroked at the expense (time) of those that were
ACTUALLY genuinely interested in the job that was posted.
In small buildings the process is basically the same only HR usually isn't involved but the trade off is you're almost guaranteed to have to listen to each and everyone one of those power trippers.