Refer to the figure below showing the diffusion of a substance into a cell over time. 
What kind of arrows, if any, should be shown in the part of the figure labeled B?
Definitions:
Final Demand
The demand for finished products by consumers, businesses, and the government, without any further processing or transformation.
Goods and Services
Represents the output of an economy, where goods are physical items and services are activities provided by others for benefit or pleasure.
MRP
In economics, Marginal Revenue Product is the additional revenue generated by employing one more unit of a resource.
Market Wage Rate
The prevailing pay scale for work performed in a specific industry or occupation in a geographical area.
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