Since the currencies of Taiwan, Korea and Hong Kong have all been falling against the dollar,
The Hong Kong dollar has been fixed against the US dollar for the past 28 years.
The main victims of a rapid currency appreciation would probably be the likes of Apple, which would see its enormous margin trimmed.
Unlikely really, as the huge margin isn\’t created in China, rather outside it. The added value inside China is just the assembly of the pieces: $5 on a iPod sort of thing. A change in the value of the yuan would increase the poster price Apple pays on export (in $) yes, but it would also reduce the price being paid on the imported pieces.