“you are trying to decide whether to trade in your laser printer for a more recent model. your usage pattern will remain unchanged, but the old and new printers use different toner cartridges. are the following items relevant or irrelevant to your decision?”
a) the trade-in value of the old printer is: RELEVANTb) paper costs are: IRRELEVANTc) the difference between the cost of toner cartridges is: RELEVANT d) the price of the new printer is: RELEVANTe) the price you paid for the old printer is: IRRELEVANT