Question

Should it be ‘affects more than 500 000 Australians’ or ‘effects more than 500 000 Australians’ ?

Answer 1

Affect. I felt like effect is something different

Answer 2

I would say affects, because effects is used in a different form like ' the effects of x on 500000 Australians' and affects is used like ' x affects 500000 Australians'