Scared money. A lot of people made strong wins at the end of 2017 and had never had money. Now they have and they sell. The really scared people were those who bought high - then they sell.
Markets are all about understanding what the economic drivers are and living with those. That is why I write the way I do - stepping back to drivers.
Then you have to conquer your own psychology.
yes our psychology we have to calm but it is very difficult. thanks @carrinm