Why isn’t everyone in favor of taxing financial speculation?

Why is there so little discussion about one of Bernie Sanders’s most important proposals — to tax financial speculation?

Buying and selling stocks and bonds in order to beat others who are buying and selling stocks and bonds is a giant zero-sum game that wastes countless resources, uses up the talents of some of the nation’s best and brightest, and subjects financial market to unnecessary risk.

High-speed traders who employ advanced technologies in order to get information a millisecond before other traders get it don’t make financial markets more efficient. They make them more vulnerable to debacles like the “Flash Crash” of May 2010.

Wall Street insiders who trade on confidential information unavailable to small investors don’t improve the productivity of financial markets. They just rig the game for themselves.

Bankers who trade in ever more complex derivatives — making bets on bets — don’t add real value. They only make the system more vulnerable to big losses, as occurred in the financial crisis of 2008.

All of which makes Sanders’s proposal for a speculation tax right on the mark.

Sanders wants to tax stock trades at a rate of 0.5 percent (a trade of $1,000 would cost of $5) and bond trades at 0.1 percent. The tax would reduce incentives for high-speed trading, insider deal-making and short-term financial betting. (Hillary Clinton also favors a financial transactions tax but only on high-speed trading.)

Another big plus: Given the gargantuan size of the financial market and the huge volume of trading occurring within it every day, this tiny tax would generate lots of revenue. Even a 0.01 percent transaction tax would raise $185 billion over 10 years, according to the nonpartisan Tax Policy Center.

Sanders’s 0.5 percent tax could thereby finance public investments that enlarge the economic pie rather than merely rearrange its slices — like tuition-free public education.

After all, Americans pay sales taxes on all sorts of goods and services, yet Wall Street traders pay no sales taxes on the stocks and bonds they buy. Which helps explains why the financial industry generates about 30 percent of America’s corporate profits but pays only about 18 percent of corporate taxes.

Naysayers led by the financial industry’s lobbyists warn that even a small tax on financial transactions would drive trading overseas, since financial trades can easily be done anywhere.

Baloney. The U.K. has had a tax on stock trades for decades yet remains one of the world’s financial powerhouses. Incidentally, that tax raises about 3 billion pounds yearly (the equivalent of $30 billion in an economy the size of the U.S.), which is pure gravy for Britain’s budget.

Americans are fed up with Wall Street’s financial games. Excessive speculation contributed to the near meltdown of 2008, which cost millions of people their jobs savings, and homes.

So why is it only Sanders who’s calling for a financial transactions tax?

Because a financial transactions tax directly threatens a major source of Wall Street’s revenue. And, if you hadn’t noticed, the Street uses a portion of its vast revenues to gain political clout.

So even though it’s an excellent idea championed by a major candidate, a financial transactions tax isn’t being discussed this election year because Wall Street won’t abide it.

Which maybe one of the best reasons for enacting it.

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Former U.S. Secretary of Labor Robert Reich is Chancellor’s Professor of Public Policy at the University of California at Berkeley and Senior Fellow at the Blum Center for Developing Economies.

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