As an engineer I learn about this Law some years ago, they call it the Conservation Law, and it applies for energy and for the mass... The law is simple:
for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity can neither be added nor be removed. Hence, the quantity of mass is conserved over time.
And is the same for energy...
Now, after that intro lets move to the real question:
¿Why there is no economic conservation law?
This is a real problem because is really easy for the human to create money from nowhere, and the best example is a coin hard fork, when we saw the born of bitcoin cash, there was a crazy big amount of money created from nowhere. So, you think someday human will stop creating money from his imagination and create a Money conservation law?
Source:
https://en.wikipedia.org/wiki/Conservation_of_massYou can't really apply laws to random things, but I do see you point here.
During the first Bitcoin cash fork, most people speculated that during the fork, one bcash and one Bitcoin would roughly equal the price of a single Bitcoin pre fork, but this obviously didn't happen.
This is the law of conservation of energy and it says that everything in this world is interconnected, nothing can arise from anywhere, nor can it disappear anywhere, under certain conditions, the substance goes into energy and vice versa.
In economics, this can be applied to goods and money. Money goes into goods and vice versa. Also, the goods can be exchanged for another product, which is called barter, and money can be exchanged for other money. Cryptocurrency refers more to money than to goods, since it itself does not have consumer value.
This is a good example, there is the law of conservation applied in economics.