Final answer:
The French Revolution was caused by a combination of intellectual and economic factors. Intellectual causes included the introduction of new concepts like popular sovereignty and ideas concerning rights. Economic causes included the burden of taxes to fund the king's extravagant lifestyle.
Step-by-step explanation:
The French Revolution was caused by a combination of intellectual and economic factors. The introduction of new concepts such as popular sovereignty and the spread of ideas concerning natural and human rights were intellectual causes. These ideas, inspired by the Enlightenment, challenged the traditional social and political order and led to demands for reform. On the other hand, economic causes such as the burden of taxes to fund the king's extravagant lifestyle also played a significant role in fueling resentment and unrest among the French population.