European Economies Are Not Stagnating
At Jacobin ((archived)[https://archive.ph/JhFbx]) an interesting exploration of how different methods can produce different GDP numbers, and how we (official statistics) might require methodological updating. The article explores a Dutch-developed method in particular: the Penn World Table. If I understand correctly, it does not use official exchanges rates to produce GDP number in a single currency (almost always, or always, USD), but purchasing power parity tables, which track real costs over time of baskets of products, which generates a price index which can be compared to different countries.
Gives you a good idea of what goes on in official statistics, and what the impact is on key figures you’ve heard about and your government uses to determine policy.