This prophecy speaks of a widespread openness to receiving the "Mark of the Beast", the symbol of the AntiChrist, which will allow everyone during the Tribulation to buy and sell.  Right now it's clearly evident that this openness is in full swing as people are very accepting of many, many new prototype "Mark of the Beast" type technologies that are being introduced all over the world.  So when the man of sin comes onto the scene, it won't take much to get people to gladly take the mark without hesitation.

UPDATE (2019-11-1): I know this prophecy is still considered as "In Progress", and will remain so until the 2nd coming of Christ.  However, I don't think that precludes this from being marked as "fulfilled" as we've gone far enough in the fulfillment of this prophecy, in my humble opinion, to classify it as fulfilled.  Not completed, as that comes later.  But rather, merely fulfilled.