There is a main difference between Physics and Economics. Physics tries to explain the laws of nature which do not change over time. But Economics tries to expl

There is a main difference between Physics and Economics. Physics tries to explain the laws of nature which do not change over time. But Economics tries to explain the laws of a system based on human knowledge and believes which is anything but robust. Using modeling techniques borrowed from Physics/Mathematics in the field of Economics can work very well but only if the laws you are investigating are robust over a given period of time. Edit: typo