The CRB index has seen a rise of 5% over the past week as optimism about economic activity and a slightly weaker dollar has helped direct investment flows into commodities, Saxo Bank's Ole Hansen told Trading Floor. Positive manufacturing data from US, Europe and China has helped commodities more or less across the board, while doubts about European sovereign debt has meant that last week's Euro rally was short lived. Crude has performed well, gold is grinding higher and copper breached $8000 on hopes for economic improvements.