The weakness of the oligopoly structure market in economics can be termed as:

1. A higher concentration ratio means a reduction in the consumer's choice.

2. Society as a whole suffers from the potential losses that reduce economic welfare.

3. New firms cannot enter the market, due to higher entry barriers.

4. It leads to a decision making bias and the irrational bias on the part of consumers.

5. cartel-like behavior reduces the level of competition in the market by raising the price of the product and reducing the output.