Investments in debt and equity securities
Investments in debt and equity securities are classified into three categories: 1) trading securities, 2)
held-to-maturity debt securities, or 3) other securities. These categories are treated differently for
purposes of measuring and accounting for changes in fair value.
Trading securities held for the purpose of generating profits from changes in market value are
recognized at their fair values in the consolidated balance sheets. Changes in unrealized gains and
losses are included in current income. Held-to-maturity debt securities are expected to be held to
maturity and are recognized at amortized cost computed based on the straight-line method in the
consolidated balance sheets. Other securities for which market quotations are available are recognized
at fair value in the consolidated balance sheets. Unrealized gains and losses for these other securities