thought experiment { trade and barter in the modern age

Kyle MacDonald traded his way from 1 red paper clip to a house.

Back to some of the earliest times of humankind, we've traded and bartered with others for goods and/or services we've needed. Overtime the face to face bartering was replaced by currency of set value.

What would it take in this modern time to achieve a trade and barter system again?

Would/can the gov't tax it? If so how do you tax an exchange of 1 hour of web support for a dozen farm raised eggs for example?

Just was pondering this while walking in to work. Please discuss.