The document discusses the Linden dollar, the currency used in the virtual world of Second Life. It provides background on the Linden dollar economy, including that it can be exchanged for real-world currencies. Some key points covered include that Linden dollars represent a limited license rather than monetary value, and that Linden Lab maintains full control over the currency and its exchange. Risks associated with the virtual economy are also examined, such as the potential loss of currency through hacking or company policy changes.