My recent column about the growth of on-demand jobs like Uber making life less predictable and secure for workers unleashed a small barrage of criticism from people who contend that workers get what they're worth in the market.
A Forbes Magazine contributor, for example, writes that jobs exist only "when both employer and employee are happy with the deal being made." So if the new jobs are low-paying and irregular, too bad.
Much the same argument was voiced in the late 19th century over alleged "freedom of contract." Any deal between employees and workers was assumed to be fine if both sides voluntarily agreed to it.
It was an era when many workers were "happy" to toil 12-hour days in sweatshops for lack of any better alternative. It was also a time of great wealth for a few and squalor for many. And of corruption, as the lackeys of robber barons deposited sacks of cash on the desks of pliant legislators.
Finally, after decades of labor strife and political tumult, the 20th century brought an understanding that capitalism requires minimum standards of decency and fairness -- workplace safety, a minimum wage, maximum hours (with time-and-a-half for overtime) and a ban on child labor.
We also learned that capitalism needs a balance of power between big corporations and workers.
We achieved that through antitrust laws that reduced the capacity of giant corporations to impose their will, and labor laws that allowed workers to organize and bargain collectively.
By the 1950s, when 35 percent of private-sector workers belonged to a labor union, they were able to negotiate higher wages and better working conditions than employers would otherwise have been "happy" to provide.
But now we seem to be heading back to 19th century.
Corporations are shifting full-time work onto temps, freelancers and contract workers who fall outside the labor protections established decades ago.
The nation's biggest corporations and Wall Street banks are larger and more potent than ever.
And labor union membership has shrunk to less than 7 percent of the private-sector workforce.
So it's not surprising we're once again hearing that workers are worth no more than what they can get in the market.
But as we should have learned a century ago, markets don't exist in nature. They're created by human beings. The real question is how they're organized and for whose benefit.
In the late 19th century, they were organized for the benefit of a few at the top. But by the middle of the 20th century they were organized for the vast majority.
During the 30 years after the end of World War II, as the economy doubled in size, so did the wages of most Americans -- along with improved hours and working conditions.
Yet since around 1980, even though the economy has doubled once again (the Great Recession notwithstanding), the wages of most Americans have stagnated. And their benefits and working conditions have deteriorated.
This isn't because most Americans are worth less. In fact, worker productivity is higher than ever.
It's because big corporations, Wall Street and some enormously rich individuals have gained political power to organize the market in ways that have enhanced their wealth while leaving most Americans behind.
That includes trade agreements protecting the intellectual property of large corporations and Wall Street's financial assets, but not American jobs and wages.
Bailouts of big Wall Street banks and their executives and shareholders when they can't pay what they owe, but not of homeowners who can't meet their mortgage payments.
Bankruptcy protection for big corporations, allowing them to shed their debts, including labor contracts. But no bankruptcy protection for college graduates overburdened with student debts.
Antitrust leniency toward a vast swath of American industry -- including Big Cable (Comcast, AT&T, Time Warner), Big Tech (Amazon, Google), Big Pharma, the largest Wall Street banks and giant retailers (Walmart).
But less tolerance toward labor unions -- as workers trying to form unions are fired with impunity, and more states adopt so-called "right-to-work" laws that undermine unions.
We seem to be heading full speed back to the late 19th century.
So what will be the galvanizing force for change this time?
Robert Reich, former U.S. Secretary of Labor, is professor of public policy at the University of California at Berkeley and the author of "Beyond Outrage," now available in paperback. His new film, "Inequality for All," is now out on iTunes, DVD and On Demand. He blogs at www.robertreich.org.