IMO, in order to gain more insight into buying and selling, maybe one should determine that in light of Revelation 18, for instance? That ch appears to be involving buying and selling. But in what sense though, I'm not entirely certain. Actually Revelation 13-14, 17-19 have a number of things in common.
Revelation 18:9 ¶And the kings of the earth, who have committed fornication and lived deliciously with her, shall bewail her, and lament for her, when they shall see the smoke of her burning,
10 Standing afar off for the fear of her torment, saying, Alas, alas, that great city Babylon, that mighty city! for in one hour is thy judgment come.
11 And the merchants of the earth shall weep and mourn over her; for no man buyeth their merchandise any more:
This would be involving the aftermath of judgment. Revelation 13 is not involving the aftermath of anything. It is involving the era of time prior to judgment. The above passage echoes Revelation 14:11---And the smoke of their torment ascendeth up for ever and ever---where that is then echoed in Revelation 19:2-3---for he hath judged the great whore, which did corrupt the earth with her fornication, and hath avenged the blood of his servants at her hand. And again they said, Alleluia. And her smoke rose up for ever and ever.
Take note that Revelation 14:11 involves torment as does Revelation 18:10. Yet some would have us believe that Revelation 14:11 = Revelation 20:11-15. Good luck getting Revelation 18:10, Revelation 19:2-3 logically fitting the scene in Revelation 20:11-15 somehow.
On a side note, Premil has to be the correct view since Rev 14:11 can't be meaning the GWTJ since the GWTJ is after the millennium and that Rev 18-19 is meaning before the millennium, otherwise, you would think Rev 14:11 indeed equals Rev 20:11-15. Except it can't because both Rev 18:10, Rev 19:2-3 already prove it can't.