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Cash is difficult to tax. I don't have a friend in the fed.

What's your daily ATM withdrawal limit? Familiar with the letters SAR? Mere suspicion of structuring requires a report. If you know any local people that work at a bank, ask he or she how many SARs are filed in the one branch per week, on average.

A major federal reserve branch maybe has $30 billion in cash on hand at any given time. The marginalization of the US cash market is almost complete after the past decade.

Lastly, consider the possiblity that those back scatter xray machines aren't about weapons.

I didn't understand a word you just wrote.

The paper money market is being closed down too.

A suitable argument could be made for both.

Is barter against the law?

It is not against the law. However, you are supposed to report barter transactions to the IRS. What percentage are actually reported is probably not all that high, but I have not seen any research on the topic.