Primary sources are important when studying historical events, because they generally give eye-witness accounts of what is going on, albeit with opinions. They give historians a view of what a certain group of people think, the actions they take, and how the events affect their everyday lives. Primary sources also allow others to build on top of it, and to give 'parts of the "whole"', such as the pieces of a puzzle, to giving those in the future a more narrow and personal outlook of things.
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The French Monarch in the earlier times had no problem spending money and they also made a lot of spending because they got this money by taxing the people of France and they also taxed the nobles who had a lot of money.
This harsh taxation which was also unfair and inefficient in structure by the monarchs resulted in the crisis in France and ultimately led to the french revolution.
These taxes were also raised at a very high rates making lives of people of France very tough.