* Global growth is projected to grow at 3.2 percent in 2012, then accelerate somewhat to 3.5 percent from 2013-2016, and then show a further slowdown to 2.7 percent from 2017-2025. At 3 percent, on average, global growth will still be somewhat higher than the period 1980-1995 but between half and a full percentage point below the growth rate from 1995-2008.
* Advanced economy growth is expected to slow down from an already meager 1.6 percent in 2011 to 1.3 percent in 2012. For 2013-2016, the outlook suggests some recovery in advanced economies, bringing these countries back to the pre-recession growth trend of a little more than 2 percent.
Medium-term (2013-2016) and long-term (2017-2025) projections are based on a growth accounting model, looking at the contributions of labor, capital and total factor productivity to growth. Growth in labor is approximated by the growth in working age population. Capital growth is derived from growth of working age population, and the past period performance in investment over GDP ratio, total factor productivity growth, capital deepening and depreciation. Total factor productivity growth is determined by the past period performance in TFP growth and labor productivity level.
The projected GDP growth, based on the growth accounting framework, is considered relative to measured trend growth of an economy. Our optimistic and pessimistic scenarios are based on the economy’s deviation from the trend growth and the growth rate needed to close the output gap.
The calculation of measures of regional and global GDP growth requires levels of GDP to weigh the growth rates of individual countries and regions by their size of GDP. The country and region GDP weights are current weights, which are the average for the beginning and the end of each period, and which are benchmarked on purchasing power parity (PPP)-adjusted GDP from Penn World Table 7.0.
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