From the table above, A/R amount for receivables - นายชยุตม์, นางสีฟ้า, นายสุทธิพงษ์ as at 31/12/2013 and 31/12/2012 was the same. Therefore, the factor which effected to increasing in doubtful expenses was decreasing in collateral. A/R used marketable securities as the collateral. According to Notification of the Securities and Exchange Commission KorThor 33/2543 ""การจัดทำบัญชีเกี่ยวกับลูกหนี้ด้อยคุณภาพของบริษัทหลักทรัพย์"", in case of the collateral is securities, the Company must record the collateral at fair value using the last bid price.
From our reviewed 'รายงานยอดหุ้นคงเหลือที่เป็นหลักประกัน' obtained from K. Knidtha (ผู้อำนวยการฝ่ายบัญชี), we noted that there was dramatically decreasing in the last bid price as at 31/12/2013 comparing with 31/12/2012. However, the quantity of collateral stock did not change from the prior year."