Thammasat-style estimate from Rangsit University economists: flood damage from 24-27 Sep 2026 across 48 provinces is about 25,345 million baht in the central case (range 16,897-33,794 million), trimming Q3 GDP growth by 0.55 points. Bangkok takes about 10,586 million baht of damage, with retail wholesale the most exposed sector there (23.4%). Nationally, manufacturing carries the largest share of risk (37.1%), then agriculture (12.7%) and wholesale/retail (11.8%). If your business is in Bangkok, the east or central region, or supplies factories there, expect weaker demand and possible disruption in the coming weeks and plan cash flow accordingly.