The introduction of the revelatory "mark of the beast". No one will be able to [legally] buy or sell without it. I suspect anyone that tries to barter or trade outside of the system will be considered and labeled a criminal for operating in black markets or tax evasion.
Multiple European countries already forbid cash payments over a few thousands euros. In my country the law is just being proposed: anything over 3000€ must be done using electronic systems (read: banks) or you risk getting a fine equivalent to 25% of the amount over the limit.
okay, if you believe stuff like that, it's hard to take you seriously. 666, the devil, he's there in your transaction? I remember when conservatives didn't like that unix has daemons. That was not particuarly a useful concern.