After almost 600 days, Australia's borders have finally reopened to millions of citizens, permanent residents and New Zealanders who've been vaccinated.

In that time, the closed international border has dramatically reshaped Australian society, in particular its workforce, which is undersupplied without migrants.

Today on the Signal, 'Fortress Australia' is finally dropping the drawbridge, but how big is the immigration gap we need to fill? And will people still want in?

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Dr Liz Allen, Demographer, Australian National University, Canberra