Rio Tinto Caterpillar Failure

Caterpillar is the world largest manufacturer of construction and mining equipment. The company produces as well engines and sells financial products. The mining industry is facing a hard year; companies like Rio Tinto claim that 2016 could have been one of the worst years in this industry. The reduction of consumption of minerals from China is one of the main reasons for this reduction. Therefore, Caterpillar production of machinery for mining is dropping.
Energy and transportation represented 40 percent of Caterpillar sales last year, however, the sales dropped over 30 percent.
The stock price of the company was quite volatile the last year, from July 2015 to January the price was going down, falling until 57 US dollars. In the first semester