According to data from S&P Global Market Intelligence shares in United Parcel Service (NYSE: UPS) are down 10.8% at the halfway point of 2018. Although the stock price closely follows perennial rival FedEx Corporation (NYSE: FDX) it's fair to say that UPS has had some stock specific issues to deal with alongside industry challenges.Image source: United Parcel Service website.There are four separate factors for investors to focus on:Continue reading