Weakness in China’s currency and a rout in its stock market in 2018 are raising warning bells among investors haunted by memories of the August 2015 devaluation scare and the ensuing volatility that spooked investors. Underscoring those fears, China’s officials reported that gross domestic product grew at a slower pace than anticipated for the third quarter. Data released late Thursday showed its economy expanding 6.5% year-over-year between July and September, compared with 6.6% expected and 6.7% in the prior period. The GDP report represented the weakest read since 2009 and was followed by a parade of statements from the People’s Bank of China, its securities regulator and banking and insurance regulator in support of the stock market and what was billed by that cohort as China’s positive economic fundamentals. Still, looking at the year so far, both China’s major stock market benchmarks and the yuan have suffered—and it market participants worry that Friday’s rebound belies grave concerns that further economic and stock-market pain lie ahead. A weak currency, which makes Chinese products more competitive on the global market—and offsets some of the impact of U.S. tariffs—could help China stave off some of the slowdown. But as the yuan still hovers near a psychologically important 7.00 mark, worries about how authorities will handle the situation are on the rise. “A steady depreciation of the yuan could help Beijing cushion the impacts of U.S. tariffs by boosting export competitiveness—ultimately supporting economic growth,” said Lukman Otunuga, research analyst at FXTM. “However, such a move is likely to fuel capital outflows, spark fears of a currency war and pressure [other] emerging markets.” “I think China is trying to walk a fine balance of easing monetary and fiscal policy to compensate for the negative effects of the trade war,” said Danske Bank chief China economist Allan von Mehren in emailed comments. Overdoing it on the easing side, he added, would “risk igniting capital outflows due to yuan devaluation and also delay the deleveraging process too much.” While the currency has sold off further versus the U.S. dollar than investors may have expected at the start of the year, but the move has been widely attributed to market forces. In light of a strengthening greenback DXY, -0.36% particularly in the second quarter of the year, emerging markets, including China, sold off. The yuan has dropped more than 6% versus the dollar so far this year, both in Beijing and in the more freely traded offshore currency. “Regardless, a scenario where the yuan sharply weakens toward 7.00 [yuan per dollar] is poised to fuel concerns over the health of the world’s second largest economy,” Otunuga said. He said that the Chinese yuan breaching the psychological level would weigh on global sentiment, with Asian emerging-market currencies sitting in the hot zone. Those are risk of the effect of China contagion include the South Korean won USDKRW, -0.57% Taiwanese dollar USDTWD, -0.3258% and Malaysian ringgit USDMYR, -0.1968% and the respective stock markets in those regions are also likely to be slammed. The fragility of China’s currency have been at least partly a byproduct of monetary tightening from the Federal Reserve and easing from the People’s Bank of China, market participants said. But the PBOC’s policy-easing measures and shore up its economy likely won’t bear fruit until the middle of next-year, Jones said.