UK grocer Sainsbury's broke its nine-year streak of like-for-like sales growth this morning (18 March), when the firm acknowledged that market conditions and tough comparables hit revenue expansion in its fourth quarter. In contrast to the other multiples, Sainsbury's does not appear to be loosing share in the UK to discounters Aldi and Lidl. But, as price competition in the market intensifies, could Sainsbury's proposition too come under increasing pressure? Here is the City's verdict.