Here are the correct placements for each country based on the provided descriptions of economic activity:
- the world's leading producers of semiconductors - Malaysia
- has become a leading financial center - Singapore
- consists of primarily low-wage and low-skilled jobs - Vietnam
So, the final arrangement would be:
- Economic Activity: the world's leading producers of semiconductors - Malaysia
- Economic Activity: has become a leading financial center - Singapore
- Economic Activity: consists of primarily low-wage and low-skilled jobs - Vietnam