The SET Index closed down 35.29 points (-2.21%) at 1,559 on 30 Sep, with trading value of about 121 billion baht. Brokerage Krungsri Securities (KSS) expects foreign funds to keep leaving because the Thai-US interest rate gap has widened, and flood risk could push GDP below target. Banks, oil refiners, airports and transport, retail (CPALL, CRC) and power producers led the fall. For a small business, this is a market signal rather than a direct cost change: watch flood-related disruption to sales and logistics, and be cautious about baht and borrowing-cost moves that follow capital outflows.