Flash Boys author Michael Lewis on trading inequalities

In his seminal work on the role of high-frequency traders in global stock markets, Michael Lewis shone a light on inequalities between traders in global financial markets.

The central thesis of Flash Boys, which is published with an updated final chapter in paperback this week, is that electronic trading has rigged the market against ordinary investors, particularly in America.

Computer algorithms allow high-frequency trading (HFT) firms to "get ahead" of institutions investing on behalf of our pension funds and savings schemes.

Kamal Ahmed spoke to him about how markets have changed, if at all, since the publication of his book.