If yield curve inverts in 2019, there are four likely outcomes.
I drew some lines and tried to imagine the future if there is a yield curve inversion in mid 2019.
Drop below the middle trend line into the trend channel that held from Sept 2009 until Nov 2017. The November 2017 breakout ended Feb 2018 and is now on bottom of that trend line. It could drop down into the previous trend channel that has lasted a long time and could endure for the rest of 2018.
SPX is at lower trend-line from 2009. If it goes lower, then it will be at lower trend-line from 2010. If it goes even lower, then it will be in bear market. If there is no trade war, I would say SPX will go up.
Bumping along top trend line is great, until price falls to lower trend line.
Based on Log chart I expect Nasdaq to rise to a maximum of 8900 in 2018.
Log chart peak-line extends to 3400 for SPX maximum target by end of 2018. Log chart trough-line extends to 2900 for SPX conservative target by end of 2018.