Productivity determines how many Products you can produce with your one-time work.

Productivity is affected by your Prestige and Work Experience.

Productivity = (Prestige + (Work Experience + Y)) / 2

Value Y is calculated based on the Work Experience of the Mentor and the level difference between Assistant and Mentor.
The lower the difference, the higher the Bonus.
Value Y can not be negative.

Note 1: level difference is calculated with the virtual levels based on XP (see Levels)
Note 2: if the Assistant's level is greater than the Mentor's level, the bonus is equal to the Work Experience of the Mentor