[Frost1x]

>If an office is moved to a less densely populated area, the average commute time of all employees collectively ends up increasing.

Not necessarily. I've lived in rural areas and the number of miles you could travel per minute is significantly higher than the miles per minute in an urban area. My current commute time would be the equivalent of around 15 miles in the very much less urban area. Also when you factor in that property is cheaper for things like parking and factor in extremely easy door to door parking, commute times drop down even more. At one point I lived in a condo and had to walk 8 minutes from my condo door down the garage to my parking spot. I now have a house and my car is directly out my side door.

Population density relative to commute doesn't seem to be such a clear cut relationship. In theory in a dense area you have to travel less, in reality people work where they can and don't want to move constantly so commute times can get quite long.