After a 16 cent rally over the past three sessions for copper prices, the market appears to be facing some moderate pressure this morning. Copper may have been weakened by negative Chinese demand reports overnight but that potential negative impact might be partially offset by residual supply side concerns from Zambia. Negative Chinese demand forecasts may be reinforced by a recent pattern of rising Shanghai weekly copper stock figures. In fact, some traders feel that seeing a decline in Chinese export figures may strengthen the argument that China is seeing economic slowing because of global economic slowing. In fact, weakness in a private survey of Euro zone might make a private survey of US Existing home sales report later this morning a very critical market development.