When considering valuation metrics, the price-to-earnings (P/E) ratio has always been the obvious choice, as calculations based on earnings are easy and come in handy. However, in the case of companies that are incurring losses or are in an early cycle of development, generating meager or no profits, price-to-sales (P/S) is a good valuation metric. It helps investors identify cheap stocks. Other than P/E and P/S, the price-to-book ratio (P/B ratio) is also an easy-to-use tool for zeroing in on low- priced s ...