Which economic mechanism does a barter system operate without?

The economic mechanism that a barter system doesn’t operate without is money.    

Money is any item or verifiable record that is generally accepted as payment for goods and services and repayment of debts in a particular country or socio-economic context,  or is easily converted to such a form.  

 

I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

The goal of the American System was to assist the United States in becoming self-sufficient economically, while spurring massive market growth throughout the nation. Most hoped that this growth would eliminate regional boundaries and draw the country together.