This hiring dilutes the upward pressure on wages in these hotspots and it is possible that there are spillovers to the rest of the labour market. This hiring can also dilute the incentive for businesses to train workers to do the required job.
On the positive side of the ledger, hiring overseas workers to overcome bottlenecks allows firms to hire the people they need to operate effectively, and to expand and invest. This benefit was clearly evident during the resources boom, and there are a wide range of businesses and industries that have benefited from hiring foreign workers.