Earlier this week Apple announced a 7:1 stock split. Each share of Apple, currently trading for around $570, will be worth about $80 after the split goes into effect. Stock split announcements like Apple's are becoming ever more rare, and for good reason. All things staying the same, a stock split could typically be trusted to rejuvenate the size of a share's liquidity premium, and therefore increase the real value of the firm's stock. Thanks to changes in market structure, this stock split liquidity effect no longer exists. The phenomena of a stock trading in the high triple digits, let alone quadruple digits (Priceline currently trades at $1,150) is a relatively new one for markets. During the decades before this one, a firm would typically announce a stock split once its shares had passed the $100 mark. Anyone reading the finance textbooks of the day—which for the most part taught that splits are irrelevant—would find this constant splitting and re-splitting to be puzzl...