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How come we can find stocks with a Price-to-Book ratio less than 1?
Book value = sell all assets and liquidate company . Then it's the value of company on book. Price = the value at which it's share gets bought or sold between investors.  If price to book value is less than one, it shows that an 100$ book value company is being traded at 99$ or below. At cheaper than actually theoretical price. Now say a company has a production plant . Situated at the most costliest real estate . Yet the company's valuation is based upon what it produces, how much orders it has etc while real estate value upon which plant is built stays in book while real investors don't take that into account (to an extend). A construction company might own a huge real estate inventory. However it might not be having enough cash flow to sustain monthly expense. In this scenario , for survival,i the company might have to sell its real estate at discount. And market investors are fox who  could smell trouble and bring price way below the book value  Hope it helps