Average Prices are shown on the trade menu. These are the average trade prices for different resources. Average prices are measured at the end of each day. One may view the last 30 days of average trade prices on the Average Trade Price History Page.
Note: The dates are measured not by Orbis date, but by the actual date.
May 18, 2015:
Food: $134 Coal: $1,198
Steel: $2,992 Oil: $986
Aluminum: $3,135 Uranium: $4,166
Munitions: $1,109 Iron: $1,161
Gasoline: $2,993 Lead: $944