Sean decided he no longer needs his smartphone, but would really like a small camera. sarah, on the other hand, has a small camera she is not using and desperately needs a smartphone. the agree to trade each other their unwanted goods for those that they want and need. sean and sarah's situation is an example of a) law of supply. b) law of demand. c) equilibrium price. d) voluntary exchange.

You are evaluating two different silicon wafer milling machines. the techron i costs $285,000, has a three-year life, and has pretax operating costs of $78,000 per year. the techron ii costs $495,000, has a five-year life, and has pretax operating costs of $45,000 per year. for both milling machines, use straight-line depreciation to zero over the project’s life and assume a salvage value of $55,000. if your tax rate is 24 percent and your discount rate is 11 percent, compute the eac for both machines.