Full employment of resources in any given market, but in this case, the market for labor. Underutilization in a specific market should not limit participation in other markets due to a simple lack of money, usually associated with employment.
Here is a social analogy for comparison and contrast:
If liberty and equality, as is thought by some are chiefly to be found in democracy, they will be best attained when all persons alike share in the government to the utmost.
Aristotle,
Politics
Greek critic, philosopher, physicist, & zoologist (384 BC - 322 BC)