I sell at best price. The truth is that best price (which is simply market price times quality) is the cap for what products will sell for on the market. To check this simply calculate "price per unit sold". To do this look at any given corp that sold its entire monthly production. Take the field "Products Sold Last Month" which is the monthly sales in sim-dollars and divide by the field "Production Last Month" which is the units produced. You can then divide that by the "Quality of the Product" to compare with market price.
Lets look at FB and Construction:
Market Price is 354
Here is a corp from that world
https://sim02.simcountry.com/cgi-bin/cgi2nova?SN_ADDRESS=wwwCountry&SN_METHOD=ccorp&miCorpNumber=2532232 Peoro Construction
Sale Strategy Best Price
Products Sold Last Month: 3,981.82M SC$
Production Last Month: 3,951,465.17
Price per Unit Sold = 3,981.82M SC$/3,951,465.17= 1007.7
Quality of the Product: 296.8
Price per Quality: 1007.7/2.968=339.5
and another with a different sale strategy:
https://sim02.simcountry.com/cgi-bin/cgi2nova?SN_ADDRESS=wwwCountry&SN_METHOD=ccorp&miCorpNumber=2880537 Merwed Construction
Sale Strategy Start at 503% of the market price and lower by 15% every month that the product remains unsold.
The offered price is updated when the produced quality changes.
Products Sold Last Month: 3,947.80M SC$
Production Last Month: 3,883,368.91
Price per Unit Sold = 3,947.80M SC$/3,883,368.91=1016.6
Quality of the Product: 303.2
Price per Quality: 1016.6/3.032=335.3
"Price per Quality" is what you can then compare back to market price. In this case, that value will never exceed 354 or the current market price for construction. Notice that the two corporations sell at a very similar "Price per Quality" despite their sell strategies. The other pattern I will point out is that the higher the produced quality, the lower the "Price per Quality" tends to be. This would be more apparent if you compared these private corporations to a "truly" public corporation selling closer to 330 quality.
Lesson concluded. Any questions?