The residual plot below suggests which violation(s) of regression assumptions? 
Definitions:
Perfect Competition
A market structure characterized by a large number of small firms, identical products, and freedom of entry and exit, leading to price-taking behavior.
Monopoly
A market structure characterized by a single seller, selling a unique product in the market. The seller faces no competition, as he is the sole seller of goods with no close substitute.
Average Cost
This is the total cost divided by the number of goods produced, representing the cost on average for each unit produced.
Marginal Cost
The financial commitment for producing one more unit of a product or service.
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