IN-STORE offers do not improve the public's perception of good prices on non-promotional goods within Co-op stores, claims a survey of 10,000 Co-op shoppers. After interviewing the shoppers at a number of Co-operative Group, United, Southern and Scotmid stores, independent analysts him said those people who bought something on promotion have no better impression of the store's prices than those who didn't buy items on promotion. However, promotions do drive up incremental sales and ...