Proroguing Parliament doesn't Work

A couple months ago you heard Michael Ignatieff say he wants to bring down the government, but you also heard the Conservatives say that an election now would delay a recovery. So if they believe that delaying a recovery is important, then why would they prorogue parliament, because if you prorogue parliament then nothing gets done. I do think that having an election is not the best thing to do, but economists say an election will not damage the economy that much. An election last 5 weeks. Proroguing Parliament will last 2 months plus the extra weeks of holidays. So in summary proroguing Parliament does not help at all.