A few years ago I paid about US$17 and rose eighty-eight stories above ground to visit the Eureka Tower Skydeck, the highest observation deck in Melbourne, Australia, and the southern hemisphere. Once there, you discover “The Edge”: for an additional US$10, you can enter a glass cube whose opaque floor suddenly became transparent and you felt as if you were floating eighty-eight stories above ground. For an additional US$13, you can get a framed photo of your horrified expression the moment the floor disappeared;

and for an additional US$9, an extra copy of the photo. The total amount I ended up paying for all of these goods and services was just shy of US$50. How did I end up spending so much?

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