When a police officer arrests someone based on an improperly issued warrant,

Answer is "the officer is liable for monetary damages".

In some cases judges commit errors when issuing warrants, they might not have had adequate reasonable justification to do as such. Or on the other hand, the data depended upon by the police may end up being incorrectly.

there is an explationation of this on a site called crash   course world history 1

your answer is rising unemployment and inflation.