Here is a little reminder about the 1940 census. If it says that the person lived in the same place in 1936 that does not mean the same address, it means the same town. Therefore, if the person lives in a big city, they may mean anywhere in the city, or even the same county. The question was asked because the economic disaster Americans were living in meant moving around to keep a roof over their heads. Millions were homeless or near homeless, but perhaps what saved them was the willingness to take in relatives and friends, pull together and make it through.
Check where the person lived also along with marriage information. A recently married couple might report living in different places four years earlier because they weren't married yet. If one person seems to be a long way from where home was four years earlier, this often leads to family in that other place, or someone just passing through town due to employment, military, CCC's...
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