Well the trading didn't stop even during the attack and Karachi stock exchange finished higher than yesterday. So theirs and Indian plans to hurt Pakistan economy by this attack , had no effect.
Pakistani are far more resilient than pansy Indians.
Similar attack in India breaks the internet.
In Pakistan its already being forgotten and it hasn't been 24 Hours yet.
It is true that Pakistanis are not strangers to terror attacks, especially peoples in Karachi, a city considered as one of the most violent cities in the world. Real investment come from outside, this kind of attacks can do wonders in that front. Few days before Baloch militants killed 9 Pakistani soldiers, but no one in the world cared. However, attack karachi stock exchange in nation's financial capital and that news is reported by the entire world media and reimpose pakistan's image as a terror infected state, which will intern affect investments. Same way BLA attack on intercontinental hotel in Gwadar caused investment prospects.