This mostly depended on the fertility of the soil nearby the manor, the amount of serfs a lord had and the trade that he had set up with other manors. The reason for this is that if a manor had fertile soil, the lord had set up ample trade between manors, and therewere enough serfs to work on the land, they were pretty much self-suficient. However, if these things were lacking, then self-sufficiency was not necessarily achieved.
We we drawn apart from each other, afraid of you will bomb each other
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D. Universal suffrage for women