South Korea\'s Financial Supervisory Service urged securities firms to strengthen soundness and liquidity management and internal controls as the markets for corporate paper and integrated margin accounts expand. It called for high-yield corporate paper products to be managed at sustainable levels and for venture-capital supply to improve in quality, not just scale. It also flagged risks from high-risk overseas investments, conflicts of interest and information barriers, and warned firms over a temporary waiver tied to margin-loan collateral ratios.