As a conclusion, it is undeniable that the Arrow-Debreu model had turn on a new leaf in the history of economics. It is the modern concept of general equilibrium in economics which indirectly set up several important theories. Nothing is perfect in this world. Of course, Arrow-Debreu model as well.Some assumptions have to be made. Criticism also may happen. However, those brilliant economists or researchers still can use this model to formulate their own theory and then ends up with a perfect ultimate theory in both economics and finance. Lastly, mistakes, problems, and weaknesses should be pointed out, corrected and improved so that Arrow-Debreu model can be applied and developed effectively.