If a company has a market cap of $10 billion and revenue of $1 billion, well that, that implies a PS ratio of 10. You're paying $10 for every $1 in sales. You can do ratios like this for all aspects of the company. For example, PE ratio or Price-To-Earnings ratio measures the Market Cap / Earnings . This tells you how much you're paying for every dollar of earnings .
kradic34 : What does financial ratio mean...