Anon, the mark has been here for quite some time. It was forced on ALL, both great and small. The hand symbolizes deeds/actions, the forehead symbolizes allegiance/ownership. It should be Gods name on our foreheads.
"This calls for wisdom. Let the person who has insight calculate the number of the beast, for it is the number of a man. That number is 666."
Solomon received 666 talents of gold each year not including the revenue from the merchants, traders, and all the Arabian kings and governors of the land. He was also famous for his wisdom. That's two points in one verse pointing to Solomon.
What do you think he received all the Gold for?
When you buy or sell something, what do you use?