Asia shares fall on commodity prices Asian markets traded lower on Wednesday, tracking losses on Wall Street as slumping commodity prices weighed on the resources sector.Oil prices edged up after US crude fell 2% overnight on global growth concerns. Copper prices fell nearly 4% on slowing Chinese demand.Investors are also looking ahead to preliminary factory activity data from China for signs of growth.Australia's benchmark S&P/ASX 200 index was down 1% to 5,051.30 points.