When people talk about currencies being strong or weak, they mean relative to other time periods. If 1 glorg is worth roughly 10 flobs for many years, but then we go through a period in which 1 glorg is only worth 5 flobs, then the glorg might be described as weak or the flob as strong.
This is assuming that prices of goods have stayed roughly the same in each currency. Occasionally, a country will revalue their currency: Flobland might introduce a new flob, worth 10 old flobs. This will change all the exchange rates by a factor of 10, but it will also change prices and salaries in Flobland by a factor of 10, so it won’t make any difference overall.
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