All this assuming that it's a literal, physical, and not allegorical mark. The problem with an allegorical mark is that I don't know how they will prevent you from buying or selling.
There are those who said that the jab was the mark, however they have not prevented anyone in any country, not even the hardest, from going to buy at a supermarket for example, therefore, and since they are already dismantling the bussines, we can rule it out.