Michael Pettis Profile picture
Oct 10, 2021 11 tweets 3 min read Read on X
1/7
Very interesting article. A series of Chinese studies may be discovering something about the high-speed rail system that France had already learned: rather than boost the economies of secondary cities, being connected...

scmp.com/news/china/sci… via @SCMPNews
2/7
to the HSR may actually reduce economic activity and encourage a brain drain. Even patent applications in secondary cities have dropped significantly, according to one study, after the city was connected to a high-speed line.
3/7
If this is true, it undermines the claim that even if much of the HSR is not economically viable today, it will generate enough growth in the less economically advanced areas to become viable in the future. The value of HSR is more likely to decline than to increase.
4/7
This reinforces a point I have made many times before, including in the linked essay. The idea that concentrating investment in poorer regions will drive economic convergence is based on a confusion about what drives growth.

carnegieendowment.org/chinafinancial…
5/7
Poorer regions are usually poorer because their social, economic, legal, and cultural institutions prevent businesses and workers from being able to absorb high levels of capital productively.
6/7
In that case more investment only generates sustainable growth when these regions are relatively underinvested, and this doesn't mean relative to more advanced regions but rather relative to their own specific institutional capacity (what I call the Hirschman level).
7/7
Once each region has as much investment as it can productively absorb — and in China most regions reached that point well over a decade ago — more investment doesn't help. What it needs is more institutional reform.
1/4
The point of this thread is not to suggest that investment in HSR, or capital deepening more generally, is economically a bad idea. It is in fact often a very good idea – for example infrastructure investment in China in the 1990s, or in the US today – but we should ...
2/4
understand both the conditions under which it can accelerate economic development and those under which further economic development will not occur without the right institutional reforms, in which case further capital deepening can actually reduce future growth.
3/4
As a corollary, the longer an investment-driven growth model has proven successful, the more politically entrenched it is likely to become – that is certainly what the historical precedents suggest – but in fact the less successful it is likely to be...
4/4
in the future as it closes the gap between actual investment and the amount of investment the region can productively absorb.

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More from @michaelxpettis

Feb 11
1/6
According to Greg Ip, in the US economy today, "rewards are going disproportionately toward capital instead of labor. Profits have soared since the pandemic. The result: Capital is triumphant, while the average worker ekes out marginal gains."
wsj.com/economy/jobs/c…
2/6
And as Marriner Eccles, FDR's Fed chairman, explained in the 1930s, this creates a dangerous illusion. The extent of business profits depends almost wholly on the purchasing power of ordinary people, which in turn depends on wages.
3/6
In a rapidly-growing developing economy, with huge unmet investment needs, it may be possible (even necessary) for profits to rise faster than wages because the resulting rise in saving can be deployed to productive investment.
Read 6 tweets
Feb 10
1/5
Reuters: "The EU should consider either an unprecedented 30% across-the-board tariff on Chinese goods or a 30% depreciation of the euro against the renminbi to counter a flood of cheap imports, a French government strategy report said on Monday."
reuters.com/world/china/fr…
2/5
I think it's only a question of time before the EU will intervene in its external account to protect its manufacturing sector, just as China has done for decades and the US is increasingly trying to do. It can implement all the reforms that have been proposed to improve...
3/5
the efficiency of its manufacturing, but while these reforms may indeed do just that, they won't improve Europe's competitive position.

This may sound counterintuitive at first, but I have a piece coming out soon in Engelsberg Ideas explaining why.
Read 5 tweets
Feb 10
1/11
SCMP: "China’s potential growth rate could fall to about 2.5 per cent in the coming years unless action is taken, prominent Chinese economist Zhou Tianyong has warned."
sc.mp/itwrt?utm_sour…
2/11
“Without a strong turnaround in total factor productivity and a meaningful expansion in household consumption, it will be difficult for China’s economic growth to reach 4 per cent or higher,” he added.
3/11
A 2-3% growth rate is becoming an increasingly popular reference growth rate for Chinese analysts. I'd argue that over the past several years, 2-3% has actually been the upper limit of growth once we strip out the "positive" impact of not recognizing bad investment.
Read 11 tweets
Feb 4
1/8
Jason Furman: "A weaker dollar may improve the economy’s long-run balance, but it does so by forcing Americans to cut back on spending. That is like telling children to eat more spinach today so they will be healthier in the future."
nytimes.com/2026/02/03/opi…
2/8
Furman is right. Currency appreciation reduces consumption costs in the short term by making imports cheaper, but in a hyperglobalized world, it also undermines domestic manufacturers by making them less competitive against foreign manufacturers.
3/8
Academic economists (mainly in the US) will argue that this is a good thing because the goal should be to maximize consumption, but the only sustainable way to maximize consumption over the longer term is to maximize production.
ft.com/content/89110b…
Read 8 tweets
Feb 3
1/4
Yicai: "China's macro leverage ratio – a measure of total debt relative to nominal GDP – rose by 11.8 percentage points to 302.3 percent in 2025, exceeding the 10.1 point increase recorded in 2024, according to a new research report by CASS.
yicaiglobal.com/news/chinas-de…
2/4
There is a lot of disagreement about the real debt-to-GDP ratio in China, especially given the difficulty of counting hidden debt, along with an "abnormal" rise in payables and receivables that reflects inability to pay debt more than it reflects rising revenues.
3/4
If we use the official total social finance number as the measure of debt, the ratio is 315%. The BIS and other entities show even higher ratios. But whatever the real number, it is among the highest in the world, perhaps exceeded only by Japan among major economies.
Read 4 tweets
Feb 2
1/7
SCMP: "Chinese scholars have called for greater urgency in reducing reliance on US dollar assets, particularly after Washington and its allies froze about US$300 billion in Russian foreign exchange reserves in 2022."
scmp.com/economy/global…
2/7
Although this may be a favorite new topic among academics – and not just Chinese academics - few seem to understand that a country cannot restructure global capital flows without also restructuring global...
3/7
trade flows, nor that a country cannot change its external imbalances without either changing its internal imbalances or changing the external imbalances (and thus the internal imbalances) of its trade partners.
Read 7 tweets

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