Martin Shrood purchased a vacant lot outside of London for £13,500, because he heard that a shopping mall was going to be built on the other side of the road. He figured that he could make a bundle by putting in a fast-food outlet on the site. As it turned out, the rumor was false. A sanitary landfill was located on the other side of the road, and Martin’s land was worthless. (£ denotes the British monetary unit, pounds sterling,)

Required:
What type of cost is the £13,500 that Martin paid for the vacant lot?