A customer stands in front of a wall of flat panel televisions at a Best Buy store in San Francisco, California. - 

On today's show, we'll talk about a plunge in the Chinese stock markets; longer TV commercials; and Allan Sloan of the Washington Post joins us to talk about the nitty gritty of how the stock and bond markets fared in 2015.

Follow David Brancaccio at @DavidBrancaccio