Presidents Trump and Xi spoke last Friday about the Phase One trade agreement between the two countries. It appears that in early January, U.S. Trade Representative Robert Lighthizer and Chinese Vice Premier Liu He will meet to sign the agreement.  There remains a lot of uncertainty in the market as to how China can fulfill its promise to purchase $40 billion (or more) worth of U.S. ag commodities as part of this agreement. That sum is a significant increase over the approximately $24 billion it purchased in 2017 prior to the trade war. First, the reported deal is a two-year commitment, so the margin increase in imports would be $32 billion over two years (an average of $16 bill per year – which may be a little less in 2020 and...