1. Why are insignificant equity securities recorded at fair market value but property plant and equipment recorded at cost and inventory recorded at lower of cost or net realizable value?

2. What is Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss)? Why are unrealized gains and losses for available-for-sale securities recorded as other comprehensive income (loss) and not as non-operating income (loss) in the income statement?

3. Why is the equity method used for significant influence equity securities?