Jonni, please be careful of those changes. Sorry, but I would differ on how supply quality benefits corporations, at least currently, in the game. I would welcome additional data but my analysis is supplies of at least 210 quality, and maybe very slightly higher, continue to offer benefits to corps.
I used several corps of differing supply qualities for a comparison. My goal was to choose corps producing the same product with a stable market price. I also wanted to attempt to average the data over a year period to minimize other varying factors. In an attempt to limit salary or welfare influence on corporation performance, I examined data in a way that would remove their influence by focusing on raw materials cost and data per unit. The lack of yearly/unit production data forces one approximation. The three corps purchase supplies at 180 qua, 210 qua, and the last averages over 260 qua.
Here were my findings:
Corp 1
https://sim04.simcountry.com/cgi-bin/cgi2nova?SN_ADDRESS=wwwCountry&SN_METHOD=ccorp&miCorpNumber=1169559 Bubbles Building Materials
Ordered Supply Quality 180
Products Sold Last Month 2,653.46M SC$
Production Last Month 2,447,069.87
Price/unit 1084
Products Sold Last Year 31,621.75M
Raw Materials Used Last Year 13,452.95M
Approx Units Sold Last Year 29,171,356
Approx Material Cost/Unit Last Year 461
Unit Sale Price - Material Cost 623
Corp 2
https://sim05.simcountry.com/cgi-bin/cgi2nova?SN_ADDRESS=wwwCountry&SN_METHOD=ccorp&miCorpNumber=2022055 Navajohill Building Materials
Ordered Supply Quality 210
Products Sold Last Month 3,193.04M SC$
Production Last Month 2,564,943.94
Price/unit 1245
Products Sold Last Year 38,691.37M
Raw Materials Used Last Year 17,713.81M
Approx Units Sold Last Year 31,077,405
Approx Material Cost/Unit Last Year 570
Unit Sale Price - Material Cost 675
Corp 3
https://sim04.simcountry.com/cgi-bin/cgi2nova?SN_ADDRESS=wwwCountry&SN_METHOD=ccorp&miCorpNumber=1994194 Bottrop Building Materials 260+ (Several Products Contracted)
Products Sold Last Month 3,325.71M SC$
Production Last Month 2,507,001.66
Price/unit 1327
Products Sold Last Year 39,561.48M
Raw Materials Used Last Year 21,139.86M
Approx Units Sold Last Year 29,812,720
Approx Material Cost/Unit Last Year 709
Unit Sale Price - Material Cost 618
My findings show that corp 1 sells its product for $623 over the cost of materials, corp 2 $675, and corp 3 $618. This would indicate to me that somewhat low (corp 1) and very high (corp 3) supply strategies are not as optimal as a supply strategy with a purchase quality of near 210.