Historical dividend-yield band valuation
Each blue-chip stock tends to trade within its own repeating range of dividend yields over decades, so a stock is judged against its own history rather than against the market. When the yield nears the high end of that band (the 'undervalued' zone), the price is low relative to the dividend and it is a buy. When the yield nears the low end (the 'overvalued' zone), it is a sell.
