102Then he demanded that everyone great, poor or rich must receive the mark of the beast in their right hand or on their forehead.

       No one could buy or sell anything without this mark. This means food, fuel, electricity, clothing, medicine or any other service on earth. 
           
           This mark must be either the name of the beast or the number that represents his name. It is the number of man, the number 6, because man was created on the sixth day.