Who is Piketty and why does he matter? His 700-page book, “Capital in the Twenty-First Century,” newly translated into English, is the best-selling book on Amazon. No largely academic book has ever achieved this distinction before.

Piketty’s central thesis is that the world has returned to its pre-World War I norms of extended periods of slow growth that will result in a further stratification of wealth in which the 0.1 percent fare better than everyone else. This is not because of the Occupy theory that the economy is rigged in an evil way to help them. It’s because of Piketty’s theory that during extended periods of slow growth, the mega rich will see their sophisticated investments in capital (stocks and other financial instruments) gain more share of a society’s wealth than everyone else accumulates through their earnings (salaries).

Many economists on the left love this thesis as providing a grand theoretical way to understand how the world has come to be the way it is — a way they don’t like. Paul Krugman leads the way, proclaiming, “This is a book that will change both the way we think about society and the way we do economics.”

It’s gotten respectful reviews from some free-market economists, and some pretty good takedowns, starting with Tyler Cowen’s essay. (Here’s a round-up of links.)

But whether you think it’s hooey or too high-falutin’ or just arcane, if you’re a believer in Proposition 13, Piketty’s emergence gives you fabulous ammo with which to shoot back at the George Skeltons, Peter Schrags and Harold Meyersons — all the lefty pundits who say it is the prime evil force driving California’s downfall. Piketty says states that have property taxes that penalize homowners if their homes increase in value are imposing what amounts to “America’s secret middle-class tax.”

Property taxes (outside of CA) a ‘secret middle-class tax’

This is from a Matt Yglesias piece in Vox:

“Piketty’s big point about the United States is that we actually do engage in substantial wealth taxation in this country. We call it property taxes, and they’re primarily paid to state and local governments. Total receipts amount to about 3 percent of national income. The burden of the tax falls largely on middle-class families, for whom a home is likely to be far and away the most valuable asset that they own. Rich people, of course, own expensive houses (sometimes two or three of them) but also accumulate considerable wealth in the stock market and elsewhere where, unlike homeowners’ equity, it can evade taxation.

“Piketty also observes that the current property tax system is curiously innocent of the significance of debt. A homeowner is taxed on the face-value of his house, whether he owns it outright or owes more to the bank than the house is worth.”

So the next time you face Prop 13 critics, call them “middle-class haters,” and say that’s the view of Paul Krugman’s favorite economist, too. If Piketty’s PR boomlet continues, you can just use his name and skip the Krugman framing.

With or without Piketty, noting that homes are the single biggest repository of reliable wealth for most middle-class families is a strong defense. But if Piketty proves to be the enduring “rock star” of the progressive community that many lefties think, that gives this pro-13 argument way more juice.

Doubt Piketty is the big deal that I say he is? Today’s NYT opinion page has both Krugman and David Brooks weighing in on his book.

But it’s going to be a world without much privacy, also thanks to advanced technology. Such tech makes it easy to track your phone and your car. And then there’s this sci-fi development in San Diego’s largest suburb, as detailed by the Center for Investigative Reporting:

“On a residential street in San Diego County, Calif., Chula Vista police had just arrested a young woman, still in her pajamas, for possession of narcotics. Before taking her away, Officer Rob Halverson paused in the front yard, held a Samsung Galaxy tablet up to the woman’s face and snapped a photo.

“Halverson fiddled with the tablet with his index finger a few times, and – without needing to ask the woman’s name or check her identification – her mug shot from a previous arrest, address, criminal history and other personal information appeared on the screen.

“Halverson had run the woman’s photograph through the Tactical Identification System, a new mobile facial recognition technology now in the hands of San Diego-area law enforcement. In an instant, the system matches images taken in the field with databases of about 348,000 San Diego County arrestees. The system itself has nearly 1.4 million booking photos because many people have multiple mug shots on record.

“The little-known program could become the largest expansion of facial recognition technology by U.S. law enforcement. Amid an international debate over collecting and sharing huge amounts of data on the public, this pilot program is putting that metadata to use in the field in real time.”

Public input? No need. Let’s just militarize!

As the report points out, this technology was developed for use on the battlefield and in hostile lands — meant for authorities bent on keeping a populace subjugated. Now it’s arrived in civilian USA …

” … without any public hearings or notice. In turn, the secrecy of the program has alarmed privacy experts and raised questions about whether San Diego is the leading edge of an alarming future –- one in which few people escape cataloging in a government database.

“Twenty-five local, state and federal law enforcement agencies -– including U.S. Immigration and Customs Enforcement, the Border Patrol, the San Diego County Sheriff’s Department and San Diego State University -– participate in the system. The project is coordinated by the San Diego Association of Governments and relies on a vast data-sharing program called the Automated Regional Justice Information System.

“For some, the use of biometric technology by police represents a radical milestone in the militarization of American law enforcement.”

Unfortunately, for most, they will just shrug it off, the way they’ve shrugged off all the insane stories the past four months about the nearly unlimited NSA spying on innocent people around the world.

That won’t change until this mass surveillance is linked to a horrendous abuse of power or to some immense financial crime.

It’s coming. Power corrupts. And the power to conduct mass surveillance on innocent and unknowing people presents opportunities for high-tech corruption that dwarf anything we’ve seen before.