Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

Why would a central bank or country not want their currency to appreciate against other currencies?
I wrote about the dynamic of why either of a lower or higher exchange rate would be good for economies in Would dropping the value of its currency be good for an economy? A strong currency allows consumers to   import goods cheaply from the rest of   the world.  A weak currency allows   producers to export goods cheaply to   the rest of the world.  People are   both consumers and producers.    Clearly, there have to be trade-offs. Strong or weak mean relative to Purchasing Power Parity (i.e. you can buy more or less of an equivalent good with the same money). Governments worrying about unemployment will try and push their currencies weaker relative to others, no matter the cost.  There will be an inflationary impact (imported inputs cost more as a currency weakens) but a country running a major surplus (like China) can afford to subsidise these costs.