The issue becomes just the latest in a long list of issues the SEC is examining regarding the current U.S. market structure, right up there with high frequency trading, dark pools, flash trading, market access, and trade tracking and reporting.

FORBES: SEC Takes Aim at Wild Market Swings

LSE's trading structure as a step in the right direction.

ECONOMIST: The London Stock Exchange

Working with the geneticists' favourite animal, the fruit fly Drosophila, Dr Gibson has pinpointed a series of so-called cryptic variations that have no effect on a protein's structure, but can nevertheless, if the circumstances are right, have a significant effect on the individual they belong to.

ECONOMIST: Genetics gets more complicated