Why did the Third Estate start to talk about overthrowing Louis XVI?

To put it simply, the third estate revolted in response to an unfair economic and political system that disproportionately taxed the middle classes and peasants while benefiting the other estates

Explanation:

from my own personal expirence food stamps has alot this makes it eaiser so we can affod bills and so we can life a better lifestyle not needing to worry about paying actual money to buy food since most people spend 100-300 dollars a month on food so this alot so we can afford other bills and other stuff we need

a drastic rise in oil prices ended decades of postwar.