A two-fer. Now that's my kind of blog post.
The "purchasing power parity index" is what a basket of goods (or in this case, a to-go bag) might cost in different parts of the world. It measures the relative value of national currencies against each other. And as it turns out, China's yuan may be undervalued using that measurement. Important, but let's not get sidetracked. Instead of the Big Mac, Innovation Insider suggests using the iPod, which is a rather backhanded offer of help.