Zero-commission stock trading app Robinhood aims to shake up the market

Stock trading has never looked particularly inviting to young, first time investors. Minimum balances and US$8 per trade fees make it hard to dip your toe in the water. Startup brokerage Robinhood, which has just raised some $13 million in venture capital, is aiming to change the game and invite a new generation of mobile investors onto the trading floor with a beautiful, simple trading app for iPhone, and zero-commission, zero minimum balance stock trading...