But rest assured, it's not just the libertarians and not just in the US.
Europe is currently facing shortages of skilled labour in many sectors of industry and business, what with the baby boomers entering retirement age in droves. Market forces of supply and demans would dictate that since the resource (skilled labour) demand increases, and the supply decreases, the price (wages) has to go ... upwards.
Basic economic theory of free markets.
So, does that happen? With few exceptions, nope. Wages continue to stagnate. Instead, lobbyists clamour for slashing social security to make part time jobs and retirement less desirable.