Sudden decrease in demand for labour due to fear of a great recession.

Sudden increase in the number of robots and machines.

Sudden inclusion into the Labour Market of excluded social groups such as Women, Blacks, First Nations, Racialized Immigrants, Homosexuals, or others.

Sudden retirement of the Baby-Boomer generation.

Sudden increase in payroll taxes.

Sudden decrease in the CAD from 0.80 to 0.60US$.