Structural unemployment has many causes; advances in technology can make some jobs redundant, offshoring production to low-cost producers means a lack of domestic demand for certain workers, and a permanent decline in demand can make some industries obsolete.
This article, courtesy of Ryan Z, is an illustration of the 2nd cause mentioned above. Australian’s, obviously, will still buy cars, but all will now be imported as domestic production ends. Car plant workers will find it difficult to find work because their skills are no longer in demand. They either move overseas to find work or retrain. The latter is far more likely but does come at a cost to the individual, through lost earnings, and the government, who are likely to partly fund re-training programmes. Building a flexible workforce can help reduce the level of structural unemployment, but this is far from easy.