Now the problem with this is that the effect is to lower expectations for wages by taking advantage of financial literacy. Someone working for them for 4 years receiving a raise every 6 months earns $2/hr more. The employer/seasoned employees point to this and say that a starting wage $2/hr higher is unreasonable. Unfortunately the fixed rate wage increases diminish over time, and if you think that moving into management/higher level positions would entitle you to more money... then I have a bridge in Brooklyn to sell you.
When employers mirror this strategy or take other similar approaches, then you end up with wages that are depressed relative to the value of the labor being provided ( or the opportunity value if that labor was applied to other activities, or used more efficiently ).
Microwaves, dishwashers, steam-injection ovens, just-in-time logistics for raw ingredient deliveries, credit cards, online ordering...
They certainly reduce the potential for theft/shrinkage! It used to be that you needed a trusted business manager/employee to manage the register, now anyone can do it and it's much harder for someone to siphon funds. All transactions are now viewable to management to more easily see what's selling and what's not.
> Given the advances in technology that have driven a more than 2x increase in real economic productivity over that period why shouldn't the starting wage be $20/hr for teenagers?
The growth in economic productivity hasn't been uniformly distributed across industries, and it's been pretty low exactly in the industries depending on cheap, low skill labor. What are the advances in technology between now and 1981 that made restaurants 2x more productive?