Employers often convince themselves the paragraphs about no responsibility and waitress (above) are the same. As it's not been explicitly said but obvious, employers often poach moderately experienced workers from other workplaces, usually for non-cash incentives or working conditions or saying the right things. Then I've seen a lot of managers say things like ooh yes look at them, they are brand new at the job and wonderful, how marvellous I am at spotting talent. Well erm, not really, the person's done the job twice before in other companies and yes they may be 'young' but you've exaggerating. Person gets pissed off after 6 months or a year as minimum wage and no development. The cycle repeats and they go and get another one. The odd one makes it to be a team leader or manager and there's back slapping about what a wonderful meritocratic and enlightened employer you are.
The £9 or so in supermarkets can be pretty good whack, since before those stonkingly large minimum wage rises which prompted supermarkets and others to raise wages from around £6.50-£7 to around £9. That it's applied to 16-18 year olds by some companies is absolutely right and good for them. The company I worked for was utterly ridiculous in that when I left nearly all paybands and skills payments had vanished completely and pretty much everyone was paid the same, literally from the day they walked in to someone that was far more valuable that may or may not mean they had 10, 20, 30 years experience. Retail makes an entire living out of keeping this individuals with flattery or letting them do other more skilled jobs to stop boredom, or other non-cash incentives. What keeps the whole show on the road sadly.