You run a boutique consulting firm in a highly specialised area: efficiency of central office functions in mining companies. Your consultants fly to assignments all around Australia. You estimate the monthly demand for your services in different cities. You have a small branch in each city, each of which has its own price list, so you can charge different prices in different cities. The table below lists prices in thousands. For example, if you charge $200k ppeerr pprroojj eecctt in the Melbourne area, you expect to be hired for just one project per month in Melbourne. If you were to charge $180k ppeerr pprroojj eecctt in the Melbourne area, instead, you would be hired for two projects per month in Melbourne.

Melbourne Brisbane Darwin Perth Price (in thousands) at which 1 project $200 $170 590 $280 is demanded Price (in thousands) at which 2 projects $180 5160 580 $240 are demanded Price (in thousands) at which 3 projects $160 $150 570 5210 are demanded