What are three underlying causes of the French Revolution?

The major three causes which resulted to French Revolution were:

1- social cause - The French society was divided into three estates. The first two estates consisted of clergy and nobility respectively. The third estate consisted of merchants, businessmen, lawyers and peasants. Third estate didn't have equal rights and the other estates enjoyed other privileges.

2- economic cause- The third estate had to pay all the taxes imposed by the king but the other estates were exempted from it. The prices of bread, which was the main staple diet of the people, rose, and there was a subsistence crisis.

3- immediate cause- Rumors spread that the king would order his troops to attack Paris because the people were revolting. Then 4000 to 5000 people gathered and formed people's militia.