Why did the Third Estate demand voting by head instead of voting by order?

The Third Estate demanded voting by head rather than by order because the traditional system of voting by estate—where each of the three orders cast a single collective vote—guaranteed that the two privileged orders, the clergy (First Estate) and the nobility (Second Estate), could consistently outvote the Third Estate.123

Because the Third Estate represented the overwhelming majority of the French population, its members argued that voting by order allowed the minority to exercise a veto over necessary reforms. Although the crown eventually granted the Third Estate twice as many deputies as the other two orders, this concession would have been meaningless if the estates continued to vote separately. Consequently, the Third Estate recognized that only by voting by head—where each individual deputy's vote counted equally—could they ensure their influence and prevent the privileged orders from paralyzing deliberations. This fundamental disagreement over procedure ultimately led the Third Estate to break away and declare itself the National Assembly, marking a pivotal moment in the French Revolution.41253