US soyoil prices may gain 15-20% if Washington backs industry demand for curbs on $1.5bn imports of from Argentina and Indonesia – although the move would be a setback for values of soymeal, as well as global palm oil. Washington trade watchdogs are due by Monday to rule on whether Argentina and Indonesia have, as some industry leaders claim, been "dumping" biodiesel on the US – ie, thanks to "unfair subsidisation", exporting it at levels deemed below fair value.