Banks, stung by plummeting mortgage values, followed. A share of Citigroup Inc. which cost $55.66 at the beginning of 2007, now costs $2.60. ATM fees can total $3 or more for using an out-of-network bank card. Since the start of 2007, shares in companies from every sector have been hit: General Motors shares have fallen from $30.30 to $2.22, less than the cost of a standard spark plug (about $3.79). New York Times Co. shares have fallen from $24.27 to $3.95, cheaper than the $4 cost of its Sunday edition. General Electric Co. shares fell from $30.30 to $9.08, cheaper...