Obstacles = Avoidance.

Today I learned that female hygiene products in Germany have a nominal tax rate of 19%, but books only 7%.

So one company is packaging tampons as books, and selling as books, and there's nothing anybody can do about it.

The path of least resistance. One of the elementary physics laws.

As a river will always find a way to flow and avoid impediments, the humankind = economy will do so. 

Situation kinda familiar to the last revelations in the Polish market. Where 90% of shops and supermarkets were working on Sundays under the title of the post offices. 

Physic... Peculiarly charming.