David Jones chief executive Mark McInnes says he expects the worst slump in sales to be in the first half of next year after the retailer forecast a 7.5 per cent fall in like-for-like sales in the next three quarters of fiscal 2009.

David Jones chief executive Mark McInnes says he expects the worst slump in sales to be in the first half of next year after the retailer forecast a 7.5 per cent fall in like-for-like sales in the next three quarters of fiscal 2009.