Gizmodo reports on a story from New Zealand about a supermarket which accidentally opened with no employees inside the store. People shopped and checked out using the self-checkout lanes. Half of the people actually paid, but note the explanation as to why the other half did not (emphasis mine):
In fact, after reviewing the tape, a religious studies professor said it seemed like everyone was going to pay until they got stuck at the self checkout machine waiting for an employee to approve an alcohol purchase. Once they couldn’t find an employee, they left with their groceries in tow.
Here we have a case of the government actually incentivizing theft and costing the store money through its moral policing. Without state laws against underage drinking, it is unlikely that stores would require employee approvals for any purchase.