World Economy China's slowdown is not the key problem for global growth — the trade war is, says chief economist at S&P Ratings -- -- China's slowing growth rate should not be a worry but an unresolved trade war between the world's two largest economies should be, Paul Gruenwald, chief economist at S&P Global Ratings, told CNBC on Monday. -- -- be," he said. Uncertainty looms over the trade war -- As the trade war intensifies, many American companies are moving supply chain logistics out of China and into Southeast Asian nations, namely Vietnam and the United States' southern neighbor, Mexico. -- -- growth" than tariffs. Washington and Beijing have been caught in a protracted trade war since early last year, and the next tariff deadline is Dec. 15.