Profit warnings: are they a signal to buy or sell?

This article first appeared on Your Money. There was more bad news this week for the British High Street as bakery firm Greggs issued a statement saying profits this year will fall short of expectations. Greggs' shares tumbled nearly 9%, or 40p, to 423p following the news as the bakery blamed tough competition, cold weather and "under pressure" consumers for the profits warning. The snack chain is the latest in a line of big name brands to issue profit warnings this year including French Connection, Debenhams, Mulberry and Ladbrokes. And while this is a worrying sign for the health...