Obama-care possibly could be the mark, because the scriptures teach no man may buy or sell, so if it is introduced like that, you know what not to do. So it could be or not, but we won't know until. Be blessed and Shalom.
Revelation 13:16-17 And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads: And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name.
To receive a mark in one's forehead is to accept what they teach. It is to be of the same mind set. To receive a mark in one's right hand is to work for him, in this case, to promote his false religion.
To buy and sell "things" is not the subject. Famine in the end of days, which could well be TODAY, is for
hearing the word of the Lord. Are we given eyes to see and ears to hear? Not all are.
Amos 8:11 Behold, the days come, saith the Lord GOD, that I will send a famine in the land, not a famine of bread, nor a thirst for water, but of hearing the words of the LORD:
The buying and selling done by those with the mark speaks of the souls of man for they are sold into idolatry, they are deceived.
Revelation 18:10-13 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. And the merchants of the earth shall weep and mourn over her; for no man buyeth their merchandise any more: The merchandise of gold, and silver, and precious stones, and of pearls, and fine linen, and purple, and silk, and scarlet, and all thyine wood, and all manner vessels of ivory, and all manner vessels of most precious wood, and of brass, and iron, and marble, And cinnamon, and odours, and ointments, and frankincense, and wine, and oil, and fine flour, and wheat, and beasts, and sheep, and horses, and chariots, and slaves, and souls of men.
The merchandise that will no longer be bought and sold by deceivers speaks of people. We are figurative "sheep, gold, silver, precious stones, wheat and souls of men." When the spiritual great city is destroyed that time ends. The millennium begins.
