The process of moving from self-employment and regular salaried employment to casual wage work is known as "Casualisation of the workforce."

So, the correct answer is: Casualisation of the workforce.

Casualisation of the workforce refers to the shift in employment patterns where individuals transition from self-employment or regular salaried employment to engaging in casual or temporary wage work. Casualisation of the workforce reflects a significant shift in employment dynamics, often driven by the changing needs of employers and the evolving nature of work in the modern economy.