Suppose there are three buyers (A, B, and C) and three sellers (D, E, and F) in a competitive market with the marginal benefit (MB) schedules shown in Table 1 and the marginal cost (MC) schedules shown in Table 2. 
Verify that the three efficiency conditions are satisfied for the market when the equilibrium price is $8.
Definitions:
Acid-Test Ratio
A financial metric that measures a company's ability to meet its short-term obligations with its most liquid assets.
Working Capital
Current assets less current liabilities.
Current Ratio
A financial metric that measures a company's ability to pay off its short-term liabilities with its short-term assets.
Marketable Securities
Short-term investments that are easily convertible into cash, typically within one year.
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