Quote ="Sal Paradise"Do you honestly believe that under Labour the country was going to see a growth spurt from 2009? Especially as they had said they would also have to reduce public spending?'"
Unless you (or the government) wants to claim either a) the Torys weren't planning larger spending cuts than Labour, or b) that the fiscal multiplier in the UK is currently less than 0 (The Conservatives own calculations had it at around 0.5) then
it is inescapable that growth would've been higher under Labour than the Conservatives. The only issue is how much higher would it have been.
Using the targets set out in Darling and Osborne's 2010 budgets (I assume steady pace of deficit reduction - both were ever so slightly back loaded), I calculate that in the 4 fiscal years from 2010/2011 - 2013/2014 the Tory were going to make cumulative net cuts (relative to Darling's plan) of 6.4% of (April 2010) GDP.
According to Oliver Blanchard (chief economist to the IMF, [url=http://www.imf.org/external/pubs/ft/wp/2013/wp1301.pdfhere[/url) a 1% cut in public spending (in developed economies since 2010) directly leads to about a 1% drop in GDP.
Therefore the Conservatives extra 6.4% of cuts would result in lower economic growth of about 1.6% for each of these four years. It thus seems reasonable to assume that instead of the Conservatives' slightly better than flat growth, we would be having around 2% growth under Labour.
ps. This only adjusts growth cuts under the Conservatives, for the extra growth due to Labour 'stimulus' (i.e. not as many cuts), so don't say it doesn't take into account things such as the Eurozone crisis and the slower than Darling expected global recovery, because it already does.