Changes in social mood cause changes in peoples behavior. So when positive social mood reaches a peak you have high stock prices and peace amongst other thing.
These sorts of agreements tend to occur at tops and the Korean summits happen to make a nice chart along with the stock market.
The timing of inter-Korean summits is…interesting. pic.twitter.com/b2TpFb5kqb
— SentimenTrader (@sentimentrader) April 27, 2018
I find the agreement remarkable given the Norths recent path. But it can be explained by the extreme positive mood that culminated with the recent mania peak in the stock market.