If a country's currency continues to depreciate for a long time, the fundamental reason is that the country's international competitiveness is declining and its economic prospects are bearish.

There are many reasons for the decline of international competitiveness, such as inflation caused by excessive currency, high national fiscal deficit, aging population, declining labor productivity, persistent foreign trade deficit and so on. These are all reasons. To sum up, the country's international competitiveness is declining and labor productivity is low.