I’ve been tracking it for nearly 2 years. I have to give a weekly report on it for my masters. Sources are from various academic and economic, non partisan sources. As well as from individual company balance sheets and press releases as well as SEC and IRS filings. I also interviewed a logistics manager via the phone of one such company. I can forward you by 78 page Global Economic thesis paper that was graded by a panel of 3 economic professionals and received a perfect score and a request by one such professor to use as an example in future courses if you’d like.