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Commodities—Gold, silver, and other precious metals
Scott Kupor • Secrets of Sand Hill Road

Perry Raskin
@perry
Trading and Exchanges: Market Microstructure for Practitioners (Financial Management Association Survey and Synthesis)
amazon.com
he helped start a research group called MIDAS, which stood for Mining Data at Stanford.
Steven Levy • In The Plex: How Google Thinks, Works, and Shapes Our Lives
In fact, we’ll explain in this chapter that you should look for what may seem to be a dull business: one that has the same customers from year to year and is growing slowly—a business that is what we call enduringly profitable.
Royce Yudkoff • HBR Guide to Buying a Small Business

Avoid businesses in which your work would be so irreplaceable that the company would be worth nothing when you decide to leave.
Royce Yudkoff • HBR Guide to Buying a Small Business
You want to buy a small business whose customers would have to work hard to switch suppliers. A great example is ADEX Machining Technologies, a specialty