The reduction of on the job injuries and illnesses would benefit employers, because they would

They will gain back time lost by employees

Explanation: When the injuries sustained on the job is reduced,the employees will be effective for longer periods. When injuries are sustained at work or on the job,it leads to a Downtime ( any time lost when normal work is not done or or not efficiently done). These downtimes will eventually lead to loss of output,but when the lost time is reduced it will lead to an increased Uptime ( time efficiently used) which will boost output and all or some of the downtimes will be gained.

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