Is the Apple Bubble Ready to Pop?

The manic swings in Apple (AAPL) shares lately are leaving investors reeling. Down $17, down $25, up $30, down $21. Even for a stock that’s seesawing around $600 a share, those point swings have been substantial: Down 2.8 percent, down 4.1 percent, up 5 percent, down 3.5 percent. In all, Apple stock has lost nearly 9 percent from its 52-week high of $644.