"Ordinarily a rare occurrence, Graham discussed a study he had commissioned in 1932 at Columbia University School of Business that estimated 200 of the 600 industrial companies—fully one in three-then listed on the New York Stock Exchange sold for less than their net current assets. More than 50 sold"
"The primary problem with net nets is their scarcity and small size. They are hard to find, and when they do appear, they are often too small to absorb much capital."