Relatively good news for HIV/AIDS in South Africa. The infection rate has leveled off, with reductions in certain age groups. Still, South Africa has 5.5 million HIV-positive people.
Justin Fox gives a quick summary of the history of rational markets in the last 80 years, which is also a summary of his books.
Ezra Klein and Tyler Cowen seem to think that some traditional brick-and-mortar stores are not lowering their prices in their competitive markets. HDMI cable seems to be very expensive in stores, but online is available for next to nothing. Klein further comments that online shopping is a wealth transfer from those not comfortable with online shopping to those who are comfortable with online shopping. It seems to me that those comfortable with online shopping are in larger, more competitive markets. Brick-and-mortar stores cater to a different demographic than online stores. Moreover, I think that particularly in the case of 80% and 90+% discounts, online stores sell excess stock or used stock, rather than stock just recently received from a manufacturer. I admit these are conjectures, though.
ThinkMarkets provides some links to crime tracking websites, and neighborhood information websites.