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.
And these stress tests, when properly designed, can provide information that typical statistical models may leave out or have trouble capturing, such as abnormally large jumps or market moves, evaporation of liquidity, prolonged periods of market distress, or structural changes in markets.