The correct answer is 'money'. When someone 'barters' something, they trade it using goods or services. For instance, if I were to 'barter' for an apple, I might give you an orange or something you thought was of equal value, or I might also do a favor for you in return for it.
Lime52 is correct, the answer is money. Bartering is still taxable by the government-they want their cut of everything so require that bartered goods be reported and sales tax is supposed to be paid for the cost of their value.
The 1934 act built upon the Radio Act of 1927, which was a temporary measure when it was passed, intended to stabilize the burgeoning but chaotic radio industry of the mid-1920s. The 1934 act added communications via common carrier and television.