> What is the replacement for that employee safeguard then?

Interestingly, as in Scandinavia (Norway, Sweden, Finland, Denmark and Iceland don't have minimum wages either), collective bargaining agreements consensually worked on by labor unions, employers and local governments. There tends to be base sector-, industry- or trade-specific agreements. Other comments[0] indicate Amazon apparently does not care for any of these.

[0] https://news.ycombinator.com/item?id=6916415

From wikipedia: "The law states that paying a worker an "immoral wage" is illegal. There is no general consensus what constitutes 'immoral' payment. One judge at a court in Krefeld, Germany, ruled that a cashier at a supermarket has to earn the equivalent of approximately 7USD per hour. The federal courts in Germany ruled that any wage lower than 75% of the average wage or salary for a specific occupation constitutes illegal payment. However, since there is no well defined legal minimum wage as of February 2013, courts are usually the ones who have the final say and will only rule for individual cases."

Unions and strikes, clearly.