China\u2019s stocks are tumbling, the yuan is sinking, and a government-backed think tank is warning of a potential financial panic. Is this 2015 all over again? Given the dramatic moves in Chinese markets over the past week, it\u2019s only natural to draw comparisons to the equity crash and yuan devaluation that rattled investors worldwide three years ago. There are certainly some similarities between now and then, but there are also key differences - including cheaper equity valuations and a less interventionist response by Chinese authorities. Below is a rundown of how today\u2019s environment stacks up against that of 2015. Scope of declines Chinese stocks have lost almost $2 trillion in five months. That\u2019s nothing to scoff at, but the pace of declines has yet to match the market\u2019s gut-wrenching selloff in 2015. That crash erased $3.2 trillion in its first three weeks or almost $1 billion for each minute of trading. While the Shanghai Composite Index sank more than 8 per cent in a single day in August 2015, its worst session in recent weeks was the 3.8 per cent drop on June 19. The picture is similar for the yuan. The 2015 devaluation triggered a nearly 3 per cent drop in just two days, shocking global investors who had grown used to a stable Chinese currency. The latest slump is comparable in magnitude, but the yuan has taken about two weeks to get there. The offshore currency was slightly weaker in Hong Kong early Thursday, after falling for 10 straight days. Stock valuations Before its 2015 crash, China\u2019s equity market was in the throes of a classic speculative bubble. The Shanghai Composite had a forward price-to-earnings ratio of 19, and hundreds of shares in the index traded for multiples that exceeded 100. The index is now valued at 10.5 times projected earnings, lower than at any time since the end of 2014. By some measures, it\u2019s the cheapest on record versus the S&P 500 Index. Economic backdrop Hard landing or soft: the debate over whether Chinese policymakers can prevent a steep economic downturn has been raging for years. Growth was decelerating in 2015, but the central bank was very much in easing mode - cutting interest rates and pumping gobs of money into the financial system. This time, authorities seem less willing to open the taps. While the central bank announced a cut to lenders\u2019 reserve requirements this week, policymakers are wary of backtracking on a high-profile clampdown on financial leverage. There\u2019s also the wild card of rising trade tensions: Donald Trump\u2019s threat to impose tariffs on another $200 billion of Chinese imports could cut as much as half a percentage point from the nation\u2019s economic growth, according to economists. Global reaction International investors have largely shaken off this year\u2019s rout in Chinese stocks. But the yuan has definitely grabbed their attention. One sign of the spillover effect: an index of firms in developed markets that get the most sales from China, including Qualcomm Inc. and Rio Tinto, has dropped about 7 per cent since the yuan\u2019s decline kicked into high gear in early June. Still, the global impact was far greater in 2015, when China\u2019s surprise devaluation sparked concern that other emerging-market countries would follow. The move triggered the first 10 per cent correction in the MSCI All-Country World Index of global stocks since the peak of Europe\u2019s sovereign-debt crisis in 2011. The Bloomberg Commodity Index slumped 25 per cent amid fears of sinking Chinese demand, its biggest annual decline since 2008. Market intervention While China\u2019s government routinely intervened in foreign exchange and stock markets in 2015, authorities appear to be taking a less heavy-handed approach these days. Yes, they\u2019ve meddled around the edges - publishing stronger-than-estimated reference rates for the yuan and asking brokerages to refrain from sudden liquidations of shares pledged as collateral for loans. But they\u2019ve so far avoided massive interventions of the sort that whipsawed traders a few years ago. \u201cWe know that China will want to avoid any similarities to 2015,\u201d said Timothy Graf, a macro strategist at State Street Corp. in London. \u201cThey\u2019re allowing markets to do their thing, having learnt that a heavy hand doesn\u2019t work.\u201d Leverage Back in 2015, it was retail margin traders who had everyone worried about China\u2019s stock market, and for good reason. Outstanding margin loans on the Shanghai and Shenzhen exchanges topped $350 billion at their peak. When the bubble burst, losses snowballed as traders were forced to sell shares to meet margin calls. While margin debt has since shrunk by more than half, a new kind of leveraged investor has stepped into the fold. More than $770 billion of Chinese shares, or about 12 per cent of the country\u2019s market capitalization, have been pledged as collateral for loans, according to data compiled by China Securities Co. and Bloomberg. The pledges, popular among company founders and other major shareholders in need of cash, have become a growing source of concern for analysts as stocks have tumbled in recent weeks. All told, leveraged purchases of shares have reached levels last seen in 2015, according to a study by China\u2019s National Institution for Finance & Development, a government-backed think tank. Capital outflows Three years ago, it looked like China might get caught in a never-ending spiral of capital outflows, a weakening yuan, and still more outflows. An estimated $1.7 trillion left the country in 2015 and 2016. This year, there are few signs of a repeat of that exodus. That\u2019s partly because China has tightened capital controls. But it also helps that Chinese home prices are still climbing in most big cities. Real estate makes up a large chunk of household wealth in China, and as long as values are rising there\u2019s less of an incentive to spirit money overseas. That said, the yuan has only recently started to weaken. The outflow picture could change quickly if losses continue.