To stay above inflation and drive growth. If wages are only keeping up with inflation and the cost of living, they can't be used as much for discretionary spending.
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Why should this be a concern of government?
I didn't say it was a concern of government. Wage growth and economic growth are a concern of anyone who watches this kind of thing.
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To answer their question
The "middle class" is the creation of government intervention in the marketplace, and won't exist without it
In actual fact, there is no such thing as a "free market." Markets are the creation of government.
Governments provide a stable currency to make markets possible. They provide a legal infrastructure and court systems to enforce the contracts that make markets possible. They provide educated workforces through public education, and those workers show up at their places of business after traveling on public roads, rails, or airways provided by government. Businesses that use the "free market" are protected by police and fire departments provided by government, and send their communications - from phone to fax to internet - over lines that follow public rights-of-way maintained and protected by government.
And, most important, the rules of the game of business are defined by government. Any sports fan can tell you that football, baseball, or hockey without rules and referees would be a mess. Similarly, business without rules won't work.
Which explains why conservative economics wiped out the middle class during the period from 1880 to 1932, and why, when Reagan again began applying conservative economics, the middle class again began to vanish in America in the 1980s - a process that has dramatically picked up steam under George W. Bush.
The conservative mantra is "let the market decide." But there is no market independent of government, so what they're really saying is, "Stop government from defending workers and building a middle class, and let the corporations decide how much to pay for labor and how to trade." This is, at best, destructive to national and international economies, and, at worst, destructive to democracy itself.
Democracy - Not "The Free Market" - Will Save America's Middle Class