This measure has since become known as the “Buffett Ratio” (most charts use GDP instead of GNP, hence the different percentages from Buffett’s quote). One obvious issue with this ratio is that it compares companies with increasing international exposure to domestic economic activity. Another potential issue revolves around higher corporate profit margins. While profit margins fluctuate with the economic cycle, changes in industry composition and industry concentration could be elevating margins long-term.
So I had subscribed to the newsletter in the mid 2000's, and it correctly called the market peak back in the summer of 2005. I acted on that information and sold a rental property in the Central Valley (before it crashed more than 50%). Yes, I had to pay some taxes, but I kept my powder dry, and was prepared when the housing market bottomed out in 2010. When the timing newsletter issued its "buy" signal, I bought back in and caught most of the upside move. So this book/newsletter saved me a lot of money in getting me out of the market before the crash.
The idea of trading prices, as opposed to physical goods, eventually made its way to other markets. In 1981, the Chicago Mercantile Exchange (CME) launched the first cash-settled futures contract on the Eurodollar. Essentially, upon expiration of a cash-settled futures contract, the seller of the contact does not physically deliver the underlying asset but instead transfers the associated cash position. Once the US Commodities Futures Trading Commission (CFTC) approved the Eurodollar futures contract, exchanges began listing cash-settled futures contracts on traditional commodities.
Limited trading hours help to reduce volatility in stock prices but also limits the liquidity of stocks. When trading hours are shorter more news reports and earnings reports are published while the markets are closed. As a result, investors have more time to process new information and general make fewer knee-jerk reactions. Read more about how trading hours vary around the world.