Australia's record intake of temporary skilled migrants during the economic downturn could boost the number of Australian-born unemployed, as research suggests it is being used as a "back door" to permanent entry by low-wage workers.

The claim comes from Monash University population expert Bob Birrell, who said more of Australia's permanent skilled migrants were being sourced from the 457 visa program, which was drawing on workers from low-wage countries in increasing numbers.

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