https://www.investing.com/news/cryptocurrency-news/cryptocurrencies-lose-75-billion-as-bitcoin-hits-6week-low-1759848

https://www.cnbc.com/2019/01/28/stocks-making-the-biggest-moves-premarket-caterpillar-ge-grubhub.html

https://www.cnbc.com/2019/01/28/1point5-trillion-us-tax-cut-has-no-major-impact-on-business-spending-plans-survey.html

https://www.cnbc.com/2019/01/28/caterpillar-earnings-q4-2018.html

https://www.investing.com/news/cryptocurrency-news/crypto-prices-drop-as-uk-seeks-to-regulate-digital-tokens-1759146

https://finance.yahoo.com/news/u-treasury-set-borrow-1-050001810.html

https://www.investing.com/news/stock-market-news/us-lifts-sanctions-on-rusal-other-firms-linked-to-russias-deripaska-1758966

https://www.investing.com/news/economy-news/top-5-things-to-know-in-the-market-on-monday-1759279

https://www.investing.com/news/commodities-news/crude-oil-prices–weekly-outlook-jan-28–feb-1-1758828

https://www.investing.com/news/commodities-news/gold–silver–copper-prices–weekly-outlook-jan-28–feb-1-1758834

https://www.investing.com/analysis/3-stocks-to-watch-in-the-coming-week-apple-facebook–amazon-200379765

https://business.nasdaq.com/marketinsite/2019/Corp/Adena-Friedman-Davos-2019.html