bad money is money that has less commodity value than exchange value.
that includes money created by fiat.
and when we barter services to try to rationalise value in our community we are now committing a crime.
as an aside, i was having a discussion with my oldest boy about "free" energy and the use of water as an energy source by spitting the hydrogen off with electric current and i had to explain that any "free" energy will be priced by tax once it is established and will therefore never be free.
just another proof that we work for government, not the other way around.