Use the following to answer questions:
Figure: Market Failure 
-(Figure: Market Failure) Look at the figure Market Failure. Suppose the supply curve represents the marginal cost of providing streetlights in a neighborhood that is composed of two people, Ann and Joe. The demand curve represents the marginal benefit that Ann receives from the streetlights. Suppose that Joe's marginal benefit from the streetlights is a constant amount equal to AC. The market would provide _____ streetlights. The efficient quantity of streetlights is _____.
Definitions:
Malignant Cells
Cells that are cancerous and have the ability to invade other parts of the body.
Interphase
Interphase is the phase of the cell cycle in which the cell prepares for division, characterized by DNA replication and increase in cell size.
G (Gap)
Refers to phases in the cell cycle where a cell grows and performs normal functions, crucial for the preparation of cell division.
Neoplasm
An accumulation of abnormally dividing cells.
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