If the US spirals into an economic crisis, I don't see how China could avoid one. China's economy relies on US demand; if Americans aren't buying Chinese goods, then Chinese factories are closing and Chinese exports will crumble. I don't think anyone knows how to raise non-US or internal Chinese demand for Chinese goods fast enough to compensate for a major shock to the US economy.

The exact terms were listed as confidential between the parties -- I'd imagine they negotiated something that seemed fair to both of them.

The larger point of the wager should transcend the specifics, of course.