The study by the German Centre for Integration and Migration Research (DeZIM) found that 21% of respondents reported thinking about emigration. Among Germans without a migration background, the share was 17%. Those who themselves immigrated to Germany were twice as likely to consider leaving (34%).
As an emigrant from a G7 country, I understand! Life is getting more difficult, more expensive, and more offending, and more dangerous in western countries. I believe it is already is all those things in other countries.
As someone who emigrated within the EU, I thought the same. The article does not say where people in Germany intend to go.
And we must not forget that if you live in Germany or in another democratic country, you are free to emigrate if you want to, while in many states like China or Russia leaving the country is highly restricted. Many of people there, if they can, flee to Europe, Australia, and other Western democracies.
Wikipedia has a table of countries with German citizens. It is mainly Western democracies.
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I think Germans who complain a lot about Germany lately do this either out of habit at this point or they really have no idea about the economic situation on a global scale. Things aren‘t going much better anywhere else. At least not for people like me and you.