Sadly, this is how most markets work in practice -- big players manipulate the prices with secret mechanisms.
IMO the "free trade" is mainly a fiction aimed to persuade others to play by some rules, to make them "compete" with industrial and financial behemoths....
The easing of exporting restrictions is leading to an 'easing of global prices' including the countries that had restrictions to protect the locals from high prices.
I think there's a lesson to be learned somewhere in there.
Japan Releases Surplus -- Rice Prices Drop
ed.z.: I am glad to hear that extra rice will at least be on the market, albeit at higher prices than last year.