GCC economic  growth is set to slow to 3.6 per cent in 2013 from 5.4 per cent in 2012 as the three-year surge in regional oil production comes to an end, a report said.However, on the ground, business conditions are expected to remain solid as governments maintain elevated levels of investment and social spending, which will ultimately support confidence and private sector activity, added the latest GCC Brief released by the National Bank of Kuwait  (NBK).Geographically, Qatar and Oman are likely to be the region’s best performers. But project market activity will also help build or sustain growth momentum in Kuwait and Saudi Arabia, the brief said.According to NBK, oil prices will average $100 per barrel over the forecast horizon – a level that allows most GCC  governments to finance higher spending without draining their financial reserves.GCC oil production  is projected to fall by 1-2 per cent per year over the next two years as Gulf Opec producers move to reverse some of the big output increases seen since 2010.But there are risks to this forecast, the report said.A major global economic downturn could see global oil market fundamentals loosen by more than expected in 2013, pushing oil prices below $100 per barrel for a prolonged period. This would put government fiscal balances under pressure and cause cuts in spending or delays in project execution, weakening economic growth.Over the medium-term, major economic reforms in areas such as the labor market, education, and competition policy are needed to enable the private sector to grow more independently of state support. Such reforms have taken a back seat of late as governments have prioritized measures to boost incomes and jobs, the brief said.Despite healthy rates of economic growth, GCC inflation remains low. Weighted consumer price inflation had fallen from 2.7 per cent mid-year to 2.0 per cent by October and is expected to have averaged 2.4 per cent in 2012. The decline has been driven by a deceleration in food price inflation in some countries, soft figures for housing rents and the lagged impact of earlier US dollar strength on import prices.A slight pick-up in inflation to 3 per cent is seen in 2013, as some of these factors go in to reverse while domestic economic growth remains strong. However, at these levels, inflation is unlikely to register as a major policy concern.Fiscal and monetary policies will remain expansionary. Aggregate GCC  government spending is seen rising by 6-8 per cent per year over the next two years and by 2014, spending could be nearly 50 per cent higher than in 2010.Lower oil production and prices will hit oil revenues, however, and the region’s budget surplus will more than halve from 12 per cent of GDP in 2012 to 5 per cent by 2014, the NBK brief added.Interest rates are expected to stay at recent record lows, in order to help manage exchange rate pegs against the US dollar.Bank lending  is also likely to remain solid overall – and particularly in those countries where growth is strongest. Banking sector profitability should see an improvement after a provisioning-affected 2012 – so long as the global economy maintains its footing.