Why is Luxembourg the richest country in Europe?

Related questions

1. Is Luxembourg poor?
2. Is Luxembourg the richest country?
3. What do people eat for breakfast in Luxembourg?
4. Is it safe in Luxembourg?
5. Can I live in Luxembourg?
6. Do they speak English in Luxembourg?
7. What is the main religion in Luxembourg?
8. What do Luxembourg people wear?
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10. What is the majority religion in Belgium and Luxembourg?

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22. #largest