It seems there is a confusion between the product quality and the technology level.
Product quality is the addition of 2 elements:
- raw materials quality
- production quality (=research level)
Raw materials quality is pretty obvious. Higher the quality of your crude oil, higher will be the quality of plastic.
Production quality is the result of your technology level vs the higher existing technology level.
Product quality has a maximum of 100.
Technology level has no limit (it’s a relative number, relative to the higher technology level existing).
Let’s take Plastic:
- raw materials quality will count for 35% of the final quality
- production technology will count for 65% of the final quality
For instance, let’s say that :
- the higher technology level existing is 400 (from any player)
- your company’s tech level is 200.
- your crude oil has a quality of 60
Your Plastic quality will be calculated this way :
Crude Oil Quality * 35% + Your Tech Level / Max Existing Tech Level * 65%
In numbers :
60 * 35% + 200 / 400 * 100 * 65% = 22.75 + 32.5 = 55.25
Now to answer your question, let’s say that you stop research but your competitor holding the 400 tech level continues to research Plastic. Let’s say he reaches a level of 600 :
60 * 35% + 200 / 600 * 100 * 65% = 22.75 + 21.66 = 44.41
Conclusion: your overall plastic quality has decreased not because your tech level has decreased but because your competitor’s tech level has increased. In other words if you don’t stay on top of research you don’t have the guarantee to keep your product quality at the same level.