The four sentences $( \text{labelled} \; 1, 2, 3$ and $4)$ below, when properly sequenced would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and key in the sequence of the four numbers as your answer:
- Businesses find automation, such as robotic employees, a big asset in terms of productivity and efficiency.
- But in recent years, robotics has had increasing impacts on unemployment, not just of manual labour, as computers are rapidly handing some white-collar and service-sector work.
- For years politicians have promised workers that they would bring back their jobs by clamping down on trade, offshoring and immigration.
- Economists, based on their research, say that the bigger threat to jobs now is not globalisation but automation.