The image below indicates the changes in concentration of female reproductive hormones over the course of a 28 day cycle. Identify the hormone that is indicated by the arrow. 
Definitions:
Normal Profit
The minimum level of earnings needed for a company to remain in business, often considered as the company's opportunity cost.
Break Even
The juncture where the aggregate of all costs matches the total income, leading to neither a profit nor a loss.
Short Run
A period of time during which at least one of a firm's inputs is fixed.
Long Run
A period in which all factors of production and costs are variable, allowing firms to adjust all inputs and achieve optimal operation.
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