Lots of players like to use the cost of producing goods as their currency for trading. By using this ratio, the value of goods in each era are as shown:
Age: | BA | IA | EMA | HMA | LMA | CA | INA | PE |
Cost | 100 | 200 | 400 | 800 | 1600 | 2400 | 3200 | 4000 |
BA value | 1 | 2 | 4 | 8 | 16 | 24 | 32 | 40 |
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Age: | ME
(2400+CA) | PME
(2800+INA) | CE
(3200+PE) | TE
(3600+ME) | FE
(4000+PME) | AF
(4500+CE) | - | - |
Cost | 4800 | 6000 | 7200 | 8400 | 10000 | 11700 | - | - |
BA value | 48 | 60 | 72 | 84 | 100 | 117 | - | - |
So offers on the trading board should look something like this:
- | BA | IA | EMA | HMA | LMA | CA | INA | PE | ME | PME | CE | TE | FE | AF |
BA | 1 | 2/1 | - | - | - | - | - | - | - | - | - | - | - | - |
IA | 1/2 | 1 | 2/1 | - | - | - | - | - | - | - | - | - | - | - |
EMA | - | 1/2 | 1 | 2/1 | - | - | - | - | - | - | - | - | - | - |
HMA | - | - | 1/2 | 1 | 2/1 | - | - | - | - | - | - | - | - | - |
LMA | - | - | - | 1/2 | 1 | 3/2 | 2/1 | - | - | - | - | - | - | - |
CA | - | - | - | - | 2/3 | 1 | 4/3 | 5/3 | 2/1 | - | - | - | - | - |
INA | - | - | - | - | 1/2 | 3/4 | 1 | 5/4 | 3/2 | 15/8 | - | - | - | - |
PE | - | - | - | - | - | 3/5 | 4/5 | 1 | 6/5 | 3/2 | 9/5 | - | - | - |
ME | - | - | - | - | - | 1/2 | 2/3 | 5/6 | 1 | 5/4 | 3/2 | 7/4 | - | - |
PME | - | - | - | - | - | - | 8/15 | 2/3 | 4/5 | 1 | 6/5 | 7/5 | 5/3 | 39/20 |
CE | - | - | - | - | - | - | - | 5/9 | 2/3 | 5/6 | 1 | 7/6 | 25/18 | 13/8 |
TE | - | - | - | - | - | - | - | - | 4/7 | 5/7 | 6/7 | 1 | 25/21 | 39/28 |
FE | - | - | - | - | - | - | - | - | - | 3/5 | 18/25 | 21/25 | 1 | 117/100 |
AF | - | - | - | - | - | - | - | - | - | 20/39 | 8/13 | 28/39 | 100/117 | 1 |
(Where [Row of Good's Age] * [Ratio] = [Column of Good's Age], so for example if you got to the PE's row, you will find (for the 3/5 you find under CA) you only need to offer 3 PE goods if you need 5 CA goods)
There is a nice, easy, and quick converter here (in an external site):
http://foe.dppro.nl/index.php?l=tools&s=fairtrade