This little red car $($shown in the center$)$ costs $$250.$ If you want to add the doors back on the car, that will cost $$100.$ Adding the tires will cost $$500,$ adding the engine will cost $$5,000,$ adding the seats will cost $$2,500,$ etc. Essentially, each part you see below will increase the cost of your $$250$ if you choose to add them to your purchase. This is an example of what pricing strategy?