migrate bash process

Hi,
I wrote the following simple bash script
just to show a friend how processes migrates:

#!/bin/bash
for ((i=0; i<10000; i++))
do
  for ((j=0; j<10000; j++))
  do
  echo $j > /dev/null
  done
done

Maybe it 's obviuos that bash child can't migrate,
but I never faced it and I can't understand why it
happens.
Does anybodies knows this behaviour?

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