Notice how that's not a story about price-fixing of a commodity but of a (delicious) intermediate industrial product destined for ultra-sophisticated buyers. There's no story about people price-fixing potatoes.
Also notice how the prices don't move up and down with incidents of potato blight or whatever.
Further: for this to be explanatory, you have to show why, after HPAI outbreaks subside... prices come back down.
When companies work together to set prices they can lower them a little sometimes (while still increasing their profits) and ruthlessly gouge the hell of out consumers the rest of the time hopefully without raising too much suspicion.
Also notice how the prices don't move up and down with incidents of potato blight or whatever.
Further: for this to be explanatory, you have to show why, after HPAI outbreaks subside... prices come back down.