China is still adding leverage at a high rate. Added Germany for comparison.
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I'm not impressed by America's addiction to debt but it's not like China can lecture the US for much longer. Both countries need a significant fiscal deficit reduction path.
The total debt amount or debt to GDP ratio isn't the only thing that matters in this conversation, but also how likely a country is to repay its debt (due to how much comprehensive savings and available money it has stashed) + what its used for (is the debt 'productive', will it be able to generate 'new money', repays itself in some way further down the line for the government and the country).
China is using its debt to raise productivity long term (various world-leading infrastructures for improved economic connectivity, universities, technological incubators, for a more skilled workforce, etc...), and in most cases its infrastructure debt repays itself.
Meanwhile, the US is adding debt (printing money) to repay an old debt and patch up trade and government deficits (remember unlike China they didn't have a single government or trade surplus year in decades) to give to its divided population for 'free' and for short term consumption to pacify them and stop a civil war from happening and continue the giant charade (that's their entire 'GDP' btw).
(Overpriced military and medical spending, student loans, now even 'reparations', single mothers and unemployment benefits, etc...).
As for how much one of them is more likely to repay its debts than the other one, just look at these facts; China is the largest net creditor in the world, the US is the largest net debtor in the world, China has the largest foreign reserves in the world, trillions more in sovereign wealth funds, trillions more in regional banks, trillions more in social security funds, in citizens' personal savings, etc). They could all be used for repayment.