Valuation ratios are the only group of business ratios that are externally and not internally driven. The market dictates valuation ratios. All three core valuation ratios are determined by the market price of the stock. All three have the same numerator, the market share price or market capitalization value of the company.
Price to Earnings Ratio
The price to earnings ratio is an analysis tool used by buyers and sellers of stock. It equates the current price for a single share of stock against the prior four quarters of earnings for that single share.
Value investing is a concept of buying and selling stocks based on business fundamentals and not as a reaction to news or market trends. It is a well accepted principle that often the market overreacts to news causing stocks to plummet in price or escalate in value. Value investors ignore this and use sound business fundamentals to trade stock. Much of historical wealth accumulation is based in value investments. There are no short-cuts or sudden actions taken by value investors. All decisions are derived by business analytics and trend lines.