Is the counterstream migration a negatively selective migration?

Counterstream migration consequently was said to be negatively selective, that is, to select migrants with less education and fewer job skills on average than those found in the streams. Counterstreams of elderly return migrants were also negatively selective.
Thereof, what are the streams and counter streams of migration?
Streams and Counter-streams of Migration: (1) Migration tends to take place largely within well-defined streams. (2) For every major migration stream, a counter-stream also develops. (3) The efficiency of the stream and the counter- stream tends to be low if the place of origin and the place of destination are similar.
Also, how are counterstreams of elderly migrants negatively selective? Counterstreams of elderly return migrants were also negatively selective. That is, migrants in the counterstreams were somewhat older, on average, and more often widowed and living dependently with relatives or others at their destination than were migrants in the stream. Gerontologists were left with a puzzle to solve.
Likewise, what are the positives and negatives of migration?
Reduces pressure on resources, and jobs in the country. This also prevents unemployment among people. Migrants who return back are more skilled, experienced and talented. This in turn benefits the source country and results in greater economic progress of that place.
Additionally, what makes a person a migration selectivity factor?
migration selectivity the tendency for certain types of people to migrate. Age, education, and other sociodemographic characteristics are migration selectivity factors.

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