Some reasons I believe that the 3rd estate should have equal rights as the 1st estate is because
1.) they don't get paid as much as someone in the 2nd estate.
2.)they have to pay for more taxes
3.) they don't get enough food
4.) because of the lack of money for paying taxes, they don't have anywhere to live.
5.) the last reason is that they get no land like the 2nd and 1st estate.