Final answer:
A stronger yuan in exchange for the US dollar would be bad news for US firms such as Apple and Yum Brands because their sales in China are worth less in US dollars and Chinese competitors' goods become less expensive.
Step-by-step explanation:
A stronger yuan in exchange for the US dollar would be bad news for US firms such as Apple and Yum Brands (which owns KFC and Pizza Hut) that have stores or restaurants in China because their sales in China are now worth less when converted to US dollars. When the yuan appreciates, it means that each yuan can be exchanged for more US dollars, resulting in lower profits for US firms when they convert their earnings in yuan back into dollars. Additionally, goods produced by Chinese competitors become less expensive, making it harder for US firms to compete in the Chinese market.