Flat growth

In one of our recent news stories, a union spokesperson was quoted as predicting "a flat growth of 3.275 million tonnes of road transport volumes, as in the fourth quarter of 2008".

'Flat growth' strikes me as an odd phrase, as it is in effect no growth at all. However Googling reveals it to be commonly used in economic contexts.

Here's an example from the BBC News website:

Example of the phrase 'flat growth' in a BBC News story

Anyone confused by the use of the phrase 'flat growth' in this headline would be enlightened by the first par ("the UK economy will not grow at all").