[bluGill]

Except that all farmers in an area need the combine on the same day. Which is why a lot of farmers don't own a combine - they hire a crew that comes with not only a combine, but also semi trucks, grain carts and all the other special equipment needed for harvest. Then when your farm is done they move to a new area (north in North America) where the harvest is ready. However at the end of the day someone needs to pay the multi-millions of dollars that the harvest operation is.