Why does scrap price rise all the time now?

Why does scrap price rise all the time now? Say my individual view, I also did reject trade 10 years, more or less to also understand some of situation, 2006 when why to abandon copper so expensive, achieve 30 go to every jins 40 more, because abroad is importing the useless copper of our country,be, there is big steamer for a long time to be bought in berth in coastal city, a few this years a lot of reject have the tendency that rise, have particular concern to environmental protection, still have trade war to have very big concern, if do not import foreign currency waste product, can bring about each domestic manufacturer serious be in short supply, have drive up price only without method, see every time have again today millions of ton foreign currency waste paper comes in, will meet tomorrow of overall market depreciate, because the waste product of foreign currency is a lot of cheaper than home, useless copper price concerns couplet to oil, when seeing the shift on oil price every time, useless metal can pyramid, glide to be able to cheapen conversely, the experience that a few this years I sum up.