well it depends on how much $$ shortage
above $x / $xx you have to pay..
different retailers different maximum limit of shortage (u don't
have to pay if shortage amount below this limit, if above that
limit you have to pay)
anyway it's always the best to be accurate in the takings..
no shortages..
no excess..
know how to pack different items into each carrier bag
fast in serving customers / clearing queues..
fast and accurate in keying codes
friendly and efficient customers services
ISO standards and etc
and many more others
and nowadays there's "mystery shoppers" or etc visiting retail
outlets / queuing at cashier making payment on the pretext of
shopper