Sometimes called the 'king of ratios', the price-to-sales ratio is one of the most useful ways to tell if a share is cheap or expensive, and is a good predictor of future share-price performance. Tim Bennett explains what it is, how you calculate it, and when you should use it - and points out some of its downsides.
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A beginner's guide to the price/earnings (p/e) ratio
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What does a PEG ratio tell you?
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