Poor methodology or even some bug in an Excel macro at the UN headquarters could well be a reason behind the sudden, synchronous decline of population in all cultures and political systems of this planet.
And like the article suggests it can be deliberate too. Am extremely skeptical of population figures in some parts of former Soviet Union. The official demographic loss figures in WW2 had tripled since 1945 but post-war census figures were never revised. That could easily account for the "demographic collapse" of 1990s.
If you're the neighbor of some country that has a number of natural resources you'd like to get a hold of then you want to do things like formulate battle plans. If you have to make a plan to conquer 10 million people, it's going to be a bit different than one for 5 million people. The 10 million one is going to take longer. And then when you figure out that country is using deception to bolster its population numbers you have to figure where they lied about these numbers. Is it everywhere, is it in the place you want to invade. Is the population actually higher where you want to invade but lower in the rest of the country. Now you have to invest in doing your own general population and capability counts to make sure you don't step 10 feet deep in a 2 foot deep pool.
I doubt this explains the world-wide phenomenon, but regionally sure. I remember in the 90s when studies brought the Nigerian population estimates down this triggered a drop of growth forecasts across sub-Saharan Africa.
Edit: changed world-wife (which sounds interesting demographically) to world-wide
Sure, it is quite far-fetched. However it is extremely uncommon that we experience unified social trends all across the board, from liberal Finland or Japan to North Korea and Taliban-run Afghanistan. Usually there are odd reversals and exceptions here and there; not this time apparently. And we still lack a satisfying theory that could account for fertility decline in every country.
The report from the original article is not a general problem rate but more specific: TÜV does mandatory technical inspections every two years. In those inspections, only safety- and environment-critical problems are checked for, so e.g. brakes, rust on structural parts, high emissions, non-working lights. But there is a whole bunch of stuff that they don't check for, e.g. heating/cooling, GPS not working, doesn't charge/start sometimes, ...
So it's quite possible that both are true: Maybe ID4 has lots of non-safety and non-environment problems, so it is in the shop very often, but still rarely fails an official inspection.
A sample of one but ours did fail the inspection (suspension). It also experienced a complete shutdown of instrument panel on the motorway: not something you reproduce easily in a regular inspection but a pretty damn serious condition. Fail to unfold the mirrors/engage parking assistant or rearview camera happened dozens of times.
None of other owners I spoke to were particularly happy with theirs either.
Assuming you are not an outlier, could it be VW has a low TÜV failure rate because they are in the shop often?
I have no idea what German auto shops do, but whenever I take my car in to a shop in the US for service (routine or otherwise) they generally include various inspections and adjustments to various things, including things that Google is telling me are part of the TÜV inspection.
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