Wallpaper is slang for a security with minimal to no market value.
How it works (Example):
Once a security becomes worthless, its hard documentation (for example, its stock certificate) no longer has any practical function. The term "wallpaper" suggests that it be used as such.
Why it Matters:
Following the Internet startup bust in the early 2000s, the stock of many web-based companies turned into wallpaper in a short span of time. The term doesn't only apply to stocks. For example, the impact of hyperinflation in Germany following World War I resulted in its currency becoming wallpaper.
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