A monopsony is a market form with a single buyer and many sellers. It gives the sole buyer power to negotiate lower prices from sellers. Key characteristics of a monopsony include a single large buyer, barriers to entry for new buyers like licensing, and sellers lacking alternative buyers. Examples include government procurement, Indian Railways, and electricity generators. The buyer has pricing power and can dictate terms, paying lower prices than in a competitive market. The degree of monopsony power depends on how elastic or responsive the supply of the good is.