The Wall Street Journal analyzed how the S&P 500 reacted on the days President Trump tweeted more optimistically about trade policy; the argument being that when the stock market is nervous, he tweets something positive to improve market confidence, such as retracting his plan to increase tariffs on China after the market reacted badly. That question about tweet impacts could be asked of commodity markets. We used the same tweet events identified by the Journal:  1. 10 April 2018: ‘Great progress’ on trade talks 2. 4 May 2018: ‘Look forward’ to meeting with Chinese President 3. 1 November 2018: Trade talks are ‘moving along nicely’ 4. 3 December 2018: ‘Very good things will happen&rsqu...