NEW YORK ( TheStreet) -- Commodities have seen a strong run up as the U.S. dollar has been under constant pressure for the past month. The issue remains that although oil and gold have risen, countries exporting them have not seen similar strength.The first example below is of the chart CurrencyShares Australian Dollar Trust ( FXA) over CurrencyShares Japanese Yen Trust ( FXY). This pair measures the strength of the Aussie/Yen currency cross. The Aussie is heavily linked to commodities and rises when copper and gold outperform, as well as when the Chinese economy shows support. It is a heavy exporter to China, which explains its link to their success.