Do you have to leave a shop to have committed shoplifting?

Answer 1

No you don't because if you leave a shop and you have shoplifted you will know and act very unusual

More detail:

You have to have actually left the store, or be on your way out the door without paying for the merchandise before you can be charged with shoplifting.

Answer 2

Yes. If the prosecuting attorney proves that you had what they call INTENT to steal the item or items, it is still shoplifting even if you never left the store. The reason that most stop loss officers let you walk out of the store is basically to make sure that they can show that you actually had the INTENT to steal the item or items and you prove that by the mere fact that you walked out.

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In some places, the charge is actually "Concealment of Merchandise". There is no requirement that you leave the premises- by concealing it from observation, you demonstrated the mentioned "intent".

Additional: In many jurisdictions you do not even have to leave the premises - it is sufficient that you "by-passed the last point of payment" (i.e. cashier), without attempting to pay for the item, whether it is concealed, or not.