Well, ive read this a few times now and i still have no idea what your saying or how you reached your conclusion.
Damn is it still not clear.
One final attempt!
Tech name: Dont know, worth 4.5 billion dollars
Research time: 100 days
Total techs researched: 3
all globally the same amount of money
Investment: 2 billion dollars per day into ALL research
Sliders: all set at 33% ( for argument sake!, tech and effiency were set at 40% actually!)
Investment in tech advance: 600 million (2000M/3=600 million and some change)
Investment in 1 tech: 200 million (600 million/3=200 million)
Total amount payed when tech is finished: 100 days times 200 million is 20,000 million or 20 billion.
Tech worth: 4.5 billion
Discrepancy: 20 billion (actual input) - 4.5 billion (cost stated for that tech) makes a 16.5 billion dollar gap!
So what makes that 20%, well thats the percentage i get when I see my input (20 billion) and also see the investment needed for that tech to be researched (which is said to be only 4.5 billion). Then i divide those two 4.5/20= around 20%.
So i can calculate all of this (again) and I have a netto yield into tech advance for that tech of only 20%.
2. You can argue that those 2 other techs were probably worth more and thats where your money was spend. In a sense, the investment for this research item is maxed out and the money flows over to the other 2. Meaning there is a smaller input of money into this tech and more in the other 2. But that would mean those other 2 techs would need an investment of OVER 20 billion dollar per item. And there are no techs in the game which need an investment that high. If there are, I didnt research them in this example!