I owned a small resto/bar in Spain. My employee's minimum wage was dictated by a sectorial collective bargaining agreement. I had to pay them at least that amount, altough I could pay more for especially good/experienced workers. The base salary was almost 3 times minimum wage. On top of that I paid almost 50% of their salary to the social security system, which covers retirement and health system contributions ( the country has full universal care). Tips are customary, but in the 5 to 10% range, but never required. No server would dream of making an issue for not getting a tip. tips are a thank you, not an obligation.