Average cost of regulation change?

Just doing some work for politcs and i have had to do a private member bill and i am just wondering if any one knows how much a possible decree change could cost
There is no such thing as an average cost of a tenet change.
It would depend on the law and what effect it would enjoy on individuals/businesses etc.

For instance to change a law to renovation labeling requirements on foods could cost many millions to the businesses.
or a law stating that it be illegal to step on cracks on the pavement would cost a minimum amount to implement and could be enforced by current authorities.

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