Here's why:
* "Human cost" is vague: What kind of cost are we talking about? Economic? Social? Political? Individual?
* "Illiterate society" is broad: Are we talking about a society where everyone is illiterate? Or a society with a high illiteracy rate?
To help me write a thesis statement, please tell me:
* What specific costs are you interested in? (e.g., poverty, lack of healthcare, political instability)
* What is the scope of illiteracy you're focusing on? (e.g., complete illiteracy, functional illiteracy, high illiteracy rates)
* What is the argument you want to make? (e.g., illiteracy is a major barrier to development, illiteracy has a devastating impact on individual lives)
Once you provide me with more information, I can create a strong, focused thesis statement for you.