Eh, it's really actually pretty hard to calculate GDPs. Many countries can't get within 1% due to reasons, so 1.6% per year isn't
that big of a difference. China also has interesting accounting systems that actually might
under-count the GDP, for example the GDP calculations mostly ignore the GDP of small firms.
> Companies with annual revenue below 360k RMB (roughly 53k USD) are exempt from VAT tax and all subsequent taxes. China has more than 65 million (2017 estimate) such micro companies, often single person, or single family (two people). If you multiply the two numbers together, it is up to 3.4 trillion USD per year. Just assuming only 1/4 to 1/2 is achieved, that is a 0.85 to 1.70 trillion USD economy, roughly 7% to 14% of overall Chinese GDP will have to be estimated, and can be potentially massively under reporting.
source: https://www.reddit.com/r/Economics/comments/aycs6x/chinas_20... - I will probably look this up in the future but can't verify this comment right now.
Here's a paper from the National Bureau of Economics Research that suggests that Chinese GDP might be understated: https://www.nber.org/papers/w23323 - this paper analyzes Chinese GDP by looking at its nighttime light usage. In this vein, I've heard that government actually tries to be conservative with the numbers so as to avoid the overstatement claims, but I have 0 sources on this.
For the Brookings paper linked in the post, one big issue with it is that it didn't account for a tax-related change that happened in 2008-09. See this reddit comment for details: https://www.reddit.com/r/Economics/comments/aycs6x/chinas_20... - this means that the overstatement is still there, but probably smaller. The author of that reddit comment emailed the authors but hasn't heard back.
It does seem like everyone will take the "OMG CHINA FAKES EVERYTHING" at face value as it confirms their biases. I don't want to speak on either side of it, growing up in China we/my parents/friends all make fun of the GDP numbers and call them chicken butt (鸡的屁 sounds like GDP). Maybe the core of the issue is that no one really has transparency so it's really hard to tell for sure, so no one, domestic or foreign, trusts the numbers given by the government. If so, maybe the objective ways of doing analysis, like satellite footage on night time lights, is the way to go (not to say the article I linked is thus 100% the truth). Anyone have other ideas on what indicators, like nighttime lights, can be used here?