It was published posthumously. It's ostensibly about the goings-on at the IRS, so there's a lot of finance- and economics-related insights and musings. Some of it is quite technical, and someone without in-depth knowledge in these fields will not get it. Yet, the book is accessible to just about anyone. The IRS, to Wallace, is an example of the bureaucratic mode of being. Of jobs that don't require pure concentration but are sapping and prone to inducing extreme boredom. In fact, the manuscript (the book was put together from a bunch of manuscripts after his death) is more about modern/post-modern life and boredom. Boredom, in fact, is the condition of modern life, per Wallace. At the same time, it's about the ends we go to simply to avoid a quiet yet highly discomforting moment. I really appreciate the book, but I'm sure I'd appreciate it more if I knew more about finance/economics.
My second suggestion is really an extension of the first. When I found myself looking for accessible introductory accounts of contemporary financial practices and critical economic forces while reading Wallace, I landed on this one. Reading The Pale King was more rewarding with a little side help. Wallace did not want to make his manuscript dense, but he wanted his readers to work hard. If one doesn't mind the effort, reading Wallace is not all that bad. It's enriching, in fact. I do consider Wallace quite conceited, though