88,828,543.9 office buildings in the world (again, innacurate, but it's math) Using only data from new york (which I know is bad) The average height of each building is 18.7 floors I'm going to pick an arbitrary number of 20 rooms per floor Now, we have our preliminary data and we can start to figure out how many doors + wheels are in these office buildings. -- For wheels There are 1,661,093,770.93 floors in the world. At 20 rooms per floor, that's 33,221,875,418.6 rooms. Each room has 1 office chair. Each office chair has 6 wheels. 33,221,875,418.6 * 6 = 199,331,252,511.6 wheels. In total, there are 199,331,252,511.6 wheels in office buildings around the world. -- For doors, it's the amount of rooms. There are 33,221,875,418.6 doors in office buildings around the world. -- Add those to our previous numbers (with rounding), and we have For Wheels: 213,191,252,512 Wheels since 2000 For Doors: 38,578,655,419 doors since 2000 Wheels wins by 174,612,597,093. ---- IN CONCLUSION In both scenarios, wheels wins. The second addition of office buildings is much more unreliable than the original one. However, both are unreliable. Also, a lot of sources of wheels and doors were not added. (suitcases, 18wheelers, factories, etc) --