MANILA, Philippines - First Metro Investment Corp. president Roberto Juanchito Dispo initiated a forum on BSP Circular 813, which amended the market valuation of government securities. Through this, valuation of benchmark tenor bonds is determined by the weighted average done deals or in the absence of it, the simple average bids. For non-benchmark securities, in the absence of both the weighted average done deals and simple average bids, interpolated yields derived from reference rates are used. This amendment effectively revised the old method of using the last traded price of any particular security as the basis in determining the value of that asset.