OECD More Than Doubles US Economic Growth Forecast Fiscal stimulus and a sustained vaccination pace are expected to spur the strongest GDP growth in 37 years. What a difference three months can make. The Organisation for Economic Co-operation and Development (OECD) has more than doubled its gross domestic product (GDP) growth forecast for the US economy since making its last projections in December. At that time, the OECD said it expected real GDP growth of 3.2% in the US in 2021, but now it expects the US economy to grow 6.5% this year. If its current predictions are accurate, it would be only the second time since 1966 that US GDP growth exceeded 6%, following behind 1984 when GDP growth was a red-hot 7.2%.