[gwright]

The notion that 'common good' is a sufficient reason to restrict individual freedom is debatable. Mainly because it isn't really a definable concept and so 'common good' ends up being a magic phrase to justify almost any restriction small or large.

Your point about minimum wages is a bit misleading. These laws are almost always framed as restrictions on employers but it is worthwhile thinking about them as prohibitions on individuals also. They prohibit individuals from taking jobs that they otherwise would be happy to take. For low-skilled workers (including teenagers) the value of a job isn't just the hourly wage, although $7/hour is better than $0/hour also.