Final answer:
The Rule of Law pyramid's third level concepts, while not explicitly defined in the provided references, include accountability, just laws, and open government, which are vital for the maintenance of a lawful society and economic growth.
Step-by-step explanation:
In the context of the Rule of Law 'pyramid,' the three concepts on the third level are not directly identified in the given references. However, based on the principles of the rule of law as outlined by the World Justice Project and the key aspects that support economic growth, it is possible to infer the concepts that are foundational to sustaining a rule of law. These include accountability, where both government and private individuals are answerable under the law; the establishment of just laws that are clear, published, stable, and evenly applied to protect fundamental rights; and open government, where lawmaking and enforcement processes are accessible, fair, and efficient.