The Poisson parameter 
is the mean number of occurrences of an event per unit of time or space during the Poisson process.
Definitions:
Supply of Oil
The total volume of oil that producers are willing to sell at various price levels during a certain time period.
Gasoline
A volatile, flammable liquid primarily used as fuel in internal combustion engines.
Equilibrium Price
The price at which the quantity of goods supplied equals the quantity demanded, hence, the market is in balance.
Market Price
The ongoing rate at which an asset or service is being offered for buying or selling.
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