All securities are measured at subsequent reporting dates at fair value, unrealised gains and losses are dealt with in the investment revaluation reserve, until the security is disposed of or is determined to be impaired, at which time the cumulative gain or loss is included in net surplus or deficit for the period.
4. INVESTMENTS IN SECURITIES
1999HK$ 1998
HK$ Other securities
Quoted unit trust investments 248,943 100,095 Market value of quoted unit trust investments 248,943 100,095 Carrying amount analysed for reporting purposes as non-current 248,943 100,095
5. INVESTMENT REVALUATION RESERVE
HK$ At 1 January 1997 Prior period adjustment on change of accounting policy (117,449) As restated at 31 December 1997 and 1 January 1998 (117,449) Unrealised loss on interests in other securities (22,606) At 31 December 1998 and 1 January 1999 (140,055) Unrealised gain on interests in other securities 148,848 At 31 December 1999 8,793xxxiii