As you all know, because of recent POHs, planks sell for 1k each or more! At first I thought, yeah, it'll all die down and santa's etc will resume their prices. BUT, when I read the news I realise it won't, because first of all, JAGeX had to add more spawns, due to the popularity, but there are only two planks in each and take ages. SECONDLY they turned planks in the Mort'ton shop into timber, so there is no shop selling cheap planks for 30gp or lower. THUS there will be an endless demand in planks, or other materials such as nails, clay and steel. Therefore the rare economy will plummet, so I advise you to start selling now!!