"Investors are massively underestimating the risk of a hard-landing in China, and indeed other BRICS (Brazil, Russia, India, China)... a 'Bloody Ridiculous Investment Concept' in my view," said Albert Edwards at Societe Generale.
"The BRICs are falling like bricks and the crises are home-blown, caused by their own boom-bust credit cycles. Industrial production is already falling in India, and Brazil will soon follow."
"There is so much spare capacity that they will start dumping goods, risking a deflation shock for the rest of the world. It no surpise that China has just imposed tariffs on imports of GM cars. I think it is highly likely that China will devalue the yuan next year, risking a trade war," he said.
China's $3.2 trillion foreign reserves have been falling for three months despite the trade surplus. Hot money is flowing out of the country. "One-way capital inflow or one-way bets on a yuan rise have become history. Our foreign reserves are basically falling every day," said Li Yang, a former central bank rate-setter.
The reserve loss acts as a form of monetary tightening, exactly the opposite of the effect during the boom. The reserves cannot be tapped to prop up China's internal banking system. To do so would mean repatriating the money – now in US Treasuries and European bonds – pushing up the yuan at the worst moment.
The economy is badly out of kilter. Consumption has fallen from 48pc to 36pc of GDP since the late 1990s. Investment has risen to 50pc of GDP. This is off the charts, even by the standards of Japan, Korea or Tawian during their catch-up spurts. Nothing like it has been seen before in modern times.
Fitch Ratings said China is hooked on credit, but deriving ever less punch from each dose. An extra dollar in loans increased GDP by $0.77 in 2007. It is $0.44 in 2011. "The reality is that China's economy today requires significantly more financing to achieve the same level of growth as in the past," said China analyst Charlene Chu.
Ms Chu warned that there had been a "massive build-up in leverage" and fears a "fundamental, structural erosion" in the banking system that differs from past downturns. "For the first time, a large number of Chinese banks are beginning to face cash pressures. The forthcoming wave of asset quality issues has the potential to become uglier than in previous episodes".
Investors had thought China was immune to a property crash because mortgage finance is just 19pc of GDP. Wealthy Chinese often buy two, three or more flats with cash to park money because they cannot invest overseas and bank deposit rates have been minus 3pc in real terms this year.
But with price to income levels reaching nosebleed levels of 18 in East coast cities, it is clear that appartments – often left empty – have themselves become a momentum trade.
Professor Patrick Chovanec from Beijing's Tsinghua School of Economics said China's property downturn began in earnest in August when construction firms reported that unsold inventories had reached $50bn. It has now turned into "a spiral of downward expectations".
A fire-sale is under way in coastal cities, with Shanghai developers slashing prices 25pc in November – much to the fury of earlier buyers, who expect refunds. This is spreading. Property sales have fallen 70pc in the inland city of Changsa. Prices have reportedly dropped 70pc in the "ghost city" of Ordos in Inner Mongolia. China Real Estate Index reports that prices dropped by just 0.3pc in the top 100 cities last month, but this looks like a lagging indicator. Meanwhile, the slowdown is creeping into core industries. Steel output has buckled.
Beijing was able to counter the global crunch in 2008-2009 by unleashing credit, acting as a shock absorber for the whole world. It is doubtful that Beijing can pull off this trick a second time.
"If investors go for growth at all costs again they are likely to find that it works even less than before and inflation returns quickly with a vengeance," said Diana Choyleva from Lombard Streeet Research.
The International Monetary Fund's Zhu Min says loans have doubled to almost 200pc of GDP over the last five years, including off-books lending.
This is roughly twice the intensity of credit growth in the five years preceeding Japan's Nikkei bubble in the late 1980s or the US housing bubble from 2002 to 2007. Each of these booms saw loan growth of near 50 percentage points of GDP.
The IMF said in November that lenders face a "steady build-up of financial sector vulnerabilities", warning if hit with multiple shocks, "the banking system could be severely impacted".
Mark Williams from Capital Economics said the great hope was that China would use is credit spree after 2008 to buy time, switching from chronic over-investment to consumer-led growth. "It hasn't work out as planned. The next few weeks are likely to reveal how little progress has been made. China may ride out the storm over the next few months, but the dangers of over-capacity and bad debt will only intensify".
In truth, China faces an epic deleveraging hangover, like the rest of us.