In the diagram, where is the central or haversian canal? 
Definitions:
Total Revenue
The overall revenue generated by a business through the sale of goods and offering of services within a set time period.
Purely Competitive Firm
A firm that operates in a market where there are many buyers and sellers, all products are identical, and there are no barriers to new firms entering the market.
Vertical Axis
The “up-down” or “north-south” measurement line on a graph or grid.
Marginal Revenue
The financial gain from disposing of one extra unit of a product or service.
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