Which of the following is an example of arbitrage?
A. Thomas buys a new stock issued by a firm on the stock exchange.
B. Romi buys a DVD from Walmart at $10 and sells it on eBay for $20.
C. A firm sells a box of cereal at $10 when the average cost of producing it is $6.
D. A local salon charges 5 percent more for all its services than a competing salon in the same locality.
Answer: B
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Refer to the figure below. In response to gradually falling inflation, this economy will eventually move from its short-run equilibrium to its long-run equilibrium. Graphically, this would be seen as 
A. long-run aggregate supply shifting leftward B. Short-run aggregate supply shifting upward C. Short-run aggregate supply shifting downward D. Aggregate demand shifting leftward