Fair trade prices. The base amount is the complexity involved in producing. For example iron, wood and water is produced by buildings that have no requirement so a factor of 1 multiplied by 100 coins. A cookie has components to to value of 43 plus 1 to make 44 multiplied by 100. Biennaly food requires an upgraded feed depot so to recover the cost of building plus the water to produce multiplied by 100. The minimum is half what it cost in time and components to produce. The maximum is three times the cost of producing.
Produce  Factor  min  base  max 

1 
50  100  300  
2 
100 
200  600  
47 
2200 
4700  13200  
3 
150  300  900 

3 
150 
300 
900 

4 
200 
400  1200 

1 
50  100  300  
14 
700 
1400  4200  
6 
300 
600  1800  
14 
650 
1400  3900 

7.5 
375 
750  2250  
2.5 
125  250  750  
1 
50  100  300  
2 
100 
200 
600  
4.46 
150 
446  1300  
7.34 
300 
734  2200  
10.68 
500  1068  3300  
14.48 
700 
1448  4500  
Credit 
80  4000  8000  16000 