French materialists believe that there is no spiritual dimension to life. They believe that there is only the physical. They also believe that humans are just fleshy robots and should not be held up to morality. They think criminals should not be punished because they are just doing what their genes tell them to do. They also want to maximize sense pleasers. Not all train of thought are weird. Some are both good and likely true.
The invisible hand of the free market is the idea of how the free market balances itself out. If one business is making a lot of money it will eventually balance out. If a business is making very little money, it will balance out. The invisible hand is the thing that makes sure the market is always balanced. It controls all. We can also learn something from the wars happening at this time.
War of the Austrian was ultimately the fault of Prussia. Prussia wanted a piece of territory, so they made up a reason to dispute the queen Austrian claim to the throne and declared war. The war had a few phases, but Prussia ultimately won.