AA barter system
BA type of plastic
CA character in a video game
DA goat native to Sardinia
Correct Option: 1
Explanation:
A barter system
The system was established in Sardinia, in 2009 after the financial crisis. It establishes credit for goods or services supplied, which is owned by the people who supplied them and is then traded online; it runs parallel with the traditional money system but unlike traditional money it does not disappear in financial crashes.
