You are Stealing !
One company has two factories,
in different parts of the country,
that were making the same style of shoes.
In both factories, workers were stealing shoes.
How, without using any security,
could that company stop the stealing ?
Both factories can manufacture only 1 leg shoe (either right or left) of the pair.
Factory 1 makes left shoe and factory 2 makes right shoe.
So the Stealing would stop as only 1 side shoes would be worthless.