= Human migration
For <demography>, <human migration> is movement that changes a person's place of usual residence across a specified territorial boundary. Counts depend on the boundary, the residence criterion and the observation interval. A commuter crossing daily and a person changing residence therefore need not be counted alike.
In the <demographic balancing equation>, immigration $I$ adds residents and emigration $E$ removes them, so net migration is $I-E$. If a district gains 800 and loses 500 residents by migration during a year, its net migration is 300, while the total number of moves is 1300. Net migration alone can conceal substantial turnover. Movement between two districts contributes to each district's account but cancels in the national total if both districts are inside the same national boundary. This accounting viewpoint is the quantitative aspect used here.
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