Final answer:
The underlying assumption of a gainsharing program is improved productivity.
Step-by-step explanation:
The underlying assumption of a gainsharing program is improved productivity.
When a company implements a gainsharing program, it means that the profits and earnings generated by the business are distributed among the employees. The assumption behind this program is that when employees directly benefit from the success of the business, there is often an increase in productivity. By sharing in the financial rewards, employees are motivated to work harder and find ways to improve their performance, ultimately leading to higher productivity levels.