Lets say you make cars and Germans make cars their currency increased in value yours decreased. So chinese people get US cars for less money compared to before the currency value changed. German cars get more expensive.
So chances are good you will sell more cars compared to your foreign competition.
its not like FACT: WEAKER CURRENCY MEANS MORE EXPORT! It just can be the case. And if your goods are not good enough and your marketing is fail etc all the currency stuff is basically useless.
The problem is no country wishes for weaker currency because weaker currency makes imports way to expensive. So countries always try to balance and print more money if their currency is to strong so decreases in value etc.
All countries do this.
