Economists advise that the law should seek efficiency. More recently, it has been suggested that common law systems are more conducive of economic growth than code-based civil law systems. This book argues that there is no theory to support such statements and provides evidence that rejects a "one-size-fits-all" approach. Both common law and civil law systems are reviewed to debunk the relationship between the efficiency of the common law hypothesis and the alleged inferiority of codified law systems.