Final answer:
Worker's compensation insurance is not universally compulsory for all manual/non-manual workers. The requirement varies by country and state.
Step-by-step explanation:
Insurance against employer's liability, also known as worker's compensation insurance, is not compulsory for all manual/non-manual workers universally.
The requirement for worker's compensation insurance varies by country and state. In some places, such as the United States, it is generally mandatory for employers to provide worker's compensation insurance for their employees, regardless of their job type. However, the specific laws and regulations can differ, so it is important to consult the local legislation or seek professional advice for accurate information.