Proponents of high immigration claim that it is necessary to alleviate purported labour shortages.
The argument was always spurious: Australia has run one of the largest migration programs in the world this century, yet has suffered from persistent labour shortages:

In effect, Australia has played a game of migration ‘whack-a-mole’ – it has imported migrants to solve skills shortages in some areas (e.g., aged care) only to create shortages in others (e.g., construction workers).
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