(Figure: Determining Surplus) In the graph, what is the formula for producer surplus? 
Definitions:
Legal Services
Professional services provided by lawyers or law firms to advise clients on legal rights and obligations, or represent them in legal matters.
Marginal Expenditure
The extra expense that comes from buying an additional unit of a product or service.
Labor Market
The marketplace in which employers find workers and workers find jobs, characterized by the supply and demand for labor.
Wage Rate
The wage rate is the amount of money paid to a worker per unit of time, often hourly or annually, in exchange for their labor in producing goods or services.
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