Shares in Ito-Yokado, Japan's largest retailer, slumped by more than 3%, while Jusco supermarkets operator Aeon dived 3.2%. The falls watered down the effect of strong gains by exporters whose fortunes are linked to the US consumer, and the Nikkei 225 ended a see-saw session up 79.19 points at 11,648.01. Stock exchange figures showed net purchases of 770bn yen (£4.2bn), the second-highest figure since the record 776 billion yen of March 1999.