This Finance survey examines (a) The costs and risks associated with a sharp fall in the value of sterling outweigh any macroeconomic benefits for the UK of export stimulus due to a weaker currency; (b) Concerns about government finances and debt sustainability can undermine the reserve currency status of a major currency
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This Finance survey examines that it seems likely that Japanese authorities intervened in the foreign exchange market recently to prop up the yen – see, for example: https://www.ft.com/content/455784ec-0465-46ee-8c73-fc5ce3e31c37. In such circumstances, intervention refers to purchases or sales of domestic or foreign currency without changing the monetary policy stance (a) Large-scale intervention by public authorities in currency markets can move exchange rates substantially (b) The effectiveness of foreign exchange interventions can last beyond one month