South African president Jacob Zuma

Once upon a time, the sovereign credit downgrade of an emerging market powerhouse would be enough to send global markets into spasms of selling. The curious case of South Africa, however, has been decidedly different.

Indeed, despite being the "S" in BRICS (Brazil, Russia, India, China—the largest emerging economies in the world—the situation in South Africa appears to have very limited spill over for other markets.