Since the developers try to bring back funny things of v1, e.g. Complexity, House Industry, Organisations (Holdings)...
I think it's time to reintroduce the Work Skill.
With it, another variable could be added to the productivity formula:
Productivity Bonus = Country Productivity Bonus + Region Productivity Bonus + Player Booster - Region Pollution Factor + Work Skill
I think a good maximum Value of the Work Skill could be +20% and should (or should not?*) only be added to the "Work as Manager Industries" (Food/Weapons.... Aircrafts?).
* Maybe it could also be added to the House Industry when using Work Units, however the effect should be halfed. So the max. is 10% to not give the "skilled" players a too great advantage.
Work Skill points should be acquired by working as emloyee and as manager. Employee work should maybe count 2x...
Also, Work Skill should become exponentially harder to level up:
Level 1: Work 4 Times: +1%
Level 2: Work another 8 Times: +2%
Level 3: Work another 16 times: +3%
Level 10: Work another 2048 times: + 10% (total: 4092)
Level 15: Work another 65536 times: +15% (total: 131.068)
Level 20: Work another 2.097.152 times: +20% (total: 4.194.300)
So somewhere around Level 15 it becomes really hard, but not impossible to level up.
Existing Hard Worker medals should be awarded with the equivalent to 50 times employee work each
at the moment such an update gets implemented.
Also after such an upgrade, Hard Worker medals could give a bonus of 10 times worked.
To balance this out, the max. pollution could be increased to 30-35% (while still having the same requirements for 0-25% polluition).
Also, to make this a win-win for the community and eRepublik Labs, a "Work Skill Booster" could be sold in e.g. the Tycoon Pack, increasing the Work Skill gain by 25, 50 or even 100%.