一，投資永恒&稀有的信息，蠻有意思。
二，PPT最后一頁(yè)對(duì)比特幣的估值采用的好像是費(fèi)雪公式。先拋開那些假定的參數(shù)，只看模型，我感覺不太對(duì)勁（整個(gè)過程沒有提到流通速率）
1，黑市電子貨幣流通量318bn，沒有看出是怎么乘出來(lái)的（看起來(lái)，這個(gè)318bn跟實(shí)際值也沒關(guān)系，2018年1月21日，加密貨幣總市值（美元）5930億 ，比特幣2057億）
2，用“電子貨幣流通量”318bn 乘以50%，得到“btc總市值”， 這兩個(gè)數(shù)字好像不是同一回事/同一個(gè)單位？
點(diǎn)擊查看圖片的原文（BTC的估值模型）
三，對(duì)于underground GDP的預(yù)估。這個(gè)數(shù)字蠻大的，具體見下文。但是其中多少是使用加密貨幣來(lái)完成的不好說(shuō)。（跟據(jù)我看的一些雜亂的信息，直觀感覺現(xiàn)在還很低。但是由于加密貨幣做這些事情成本低效率高，將會(huì)增長(zhǎng)很快）
underground economy 定義
The underground economy refers to illegal economic activity. Transactions in the underground economy are illegal either because the good or service being traded is illegal or because an otherwise licit transaction does not comply with government reporting requirements. An example of the first category includes drugs and prostitution in most jurisdictions. An example of the second category includes untaxed labor and sales and the smuggling of goods to avoid duties. The underground economy is also referred to as the shadow economy, black market (not gray market) and the informal economy.
GDP占比：
According to estimates, the American underground economy was approximately 8% of GDP, or $1 trillion, in 2009.（Estimates of the size of the underground economy in the United States range between 7 and 11% of the total economy as of 2016.） The OECD average underground economy was approximately 20% from 1999 to 2010. France underground economy was closer to 15% while Mexico's was closer to 30%.
（備注：The OECD was established on Dec. 14, 1960, by 18 European nations plus the United States and Canada. It has expanded over time to include members from South America and the Asia-Pacific region. It includes most of the highly developed economies.）
