How not to do financial transaction tax

JDN 2457520

I strongly support the implementation of a financial transaction tax; like a basic income, it’s one of those economic policy ideas that are so brilliantly simple it’s honestly a little hard to believe how incredibly effective they are at making the world a better place. You mean we might be able to end stock market crashes just by implementing this little tax that most people will never even notice, and it will raise enough revenue to pay for food stamps? Yes, a financial transaction tax is that good.

So, keep that in mind when I say this:

TruthOut’s proposal for a financial transaction tax is somewhere between completely economically illiterate and outright insane.

They propose a 10% transaction tax on stocks and a 1% transaction tax on notional value of derivatives, then offer a “compromise” of 5% on stocks and 0.5% on derivatives. They make a bunch of revenue projections based on these that clearly amount to nothing but multiplying the current amount of transactions by the tax rate, which is so completely wrong we now officially have a left-wing counterpart to trickle-down voodoo economics.

Their argument is basically like this (I’m paraphrasing): “If we have to pay 5% sales tax on groceries, why shouldn’t you have to pay 5% on stocks?”

But that’s not how any of this works.

Demand for most groceries is very inelastic, especially in the aggregate. While you might change which groceries you’ll buy depending on their respective prices, and you may buy in bulk or wait for sales, over a reasonably long period (say a year) across a large population (say all of Michigan or all of the US), total amount of spending on groceries is extremely stable. People only need a certain amount of food, and they generally buy that amount and then stop.

So, if you implement a 5% sales tax that applies to groceries (actually sales tax in most states doesn’t apply to most groceries, but honestly it probably should—offset the regressiveness by providing more social services), people would just… spend about 5% more on groceries. Probably a bit less than that, actually, since suppliers would absorb some of the tax; but demand is much less elastic for groceries than supply, so buyers would bear most of the incidence of the tax. (It does not matter how the tax is collected; see my tax incidence series for further explanation of why.)

Other goods like clothing and electronics are a bit more elastic, so you’d get some deadweight loss from the sales tax; but at a typical 5% to 10% in the US this is pretty minimal, and even the hefty 20% or 30% VATs in some European countries only have a moderate effect. (Denmark’s 180% sales tax on cars seems a bit excessive to me, but it is Pigovian to disincentivize driving, so it also has very little deadweight loss.)

But what would happen if you implemented a 5% transaction tax on stocks? The entire stock market would immediately collapse.

A typical return on stocks is between 5% and 15% per year. As a rule of thumb, let’s say about 10%.

If you pay 5% sales tax and trade once per year, tax just cut your return in half.

If you pay 5% sales tax and trade twice per year, tax destroyed your return completely.

Even if you only trade once every five years, a 5% sales tax means that instead of your stocks being worth 61% more after those 5 years they are only worth 53% more. Your annual return has been reduced from 10% to 8.9%.

But in fact there are many perfectly legitimate reasons to trade as often as monthly, and a 5% tax would make monthly trading completely unviable.

Even if you could somehow stop everyone from pulling out all their money just before the tax takes effect, you would still completely dry up the stock market as a source of funding for all but the most long-term projects. Corporations would either need to finance their entire operations out of cash or bonds, or collapse and trigger a global depression.

Derivatives are even more extreme. The notional value of derivatives is often ludicrously huge; we currently have over a quadrillion dollars in notional value of outstanding derivatives. Assume that say 10% of those are traded every year, and we’re talking $100 trillion in notional value of transactions. At 0.5% you’re trying to take in a tax of $500 billion. That sounds fantastic—so much money!—but in fact what you should be thinking about is that’s a really strong avoidance incentive. You don’t think banks will find a way to restructure their trading practices—or stop trading altogether—to avoid this tax?

Honestly, maybe a total end to derivatives trading would be tolerable. I certainly think we need to dramatically reduce the amount of derivatives trading, and much of what is being traded—credit default swaps, collateralized debt obligations, synthetic collateralized debt obligations, etc.—really should not exist and serves no real function except to obscure fraud and speculation. (Credit default swaps are basically insurance you can buy on other people’s companies. There’s a reason you’re not allowed to buy insurance on other people’s stuff!) Interest rate swaps aren’t terrible (when they’re not being used to perpetrate the largest white-collar crime in history), but they also aren’t necessary. You might be able to convince me that commodity futures and stock options are genuinely useful, though even these are clearly overrated. (Fun fact: Futures markets have been causing financial crises since at least Classical Rome.) Exchange-traded funds are technically derivatives, and they’re just fine (actually ETFs are very low-risk, because they are inherently diversified—which is why you should probably be buying them); but actually their returns are more like stocks, so the 0.5% might not be insanely high in that case.

But stocks? We kind of need those. Equity financing has been the foundation of capitalism since the very beginning. Maybe we could conceivably go to a fully debt-financed system, but it would be a radical overhaul of our entire financial system and is certainly not something to be done lightly.

Indeed, TruthOut even seems to think we could apply the same sales tax rate to bonds, which means that debt financing would also collapse, and now we’re definitely talking about global depression. How exactly is anyone supposed to finance new investments, if they can’t sell stock or bonds? And a 5% tax on the face value of stock or bonds, for all practical purposes, is saying that you can’t sell stock or bonds. It would make no one want to buy them.

Wealthy investors buying of stocks and bonds is essentially no different than average folks buying food, clothing or other real “goods and services.”

Yes it is. It is fundamentally different.

People buy goods to use them. People buy stocks to make money selling them.

This seems perfectly obvious, but it is a vital distinction that seems to be lost on TruthOut.

When you buy an apple or a shoe or a phone or a car, you care how much it costs relative to how useful it is to you; if we make it a bit more expensive, that will make you a bit less likely to buy it—but probably not even one-to-one so that a 5% tax would reduce purchases by 5%; it would probably be more like a 2% reduction. Demand for goods is inelastic. Taxing them will raise a lot of revenue and not reduce the quantity purchased very much.

But when you buy a stock or a bond or an interest rate swap, you care how much it costs relative to what you will be able to sell it for—you care about not its utility but its return. So a 5% tax will reduce the amount of buying and selling by substantially more than 5%—it could well be 50% or even 100%. Demand for financial assets is elastic. Taxing them will not raise much revenue but will substantially reduce the quantity purchased.

Now, for some financial assets, we want to reduce the quantity purchased—the derivatives market is clearly too big, and high-frequency trading that trades thousands of times per second can do nothing but destabilize the financial system. Joseph Stiglitz supports a small financial transaction tax precisely because it would substantially reduce high-frequency trading, and he’s a Nobel Laureate as you may recall. Naturally, he was excluded from the SEC hearings on the subject, because reasons. But the figures Stiglitz is talking about (and I agree with) are on the order of 0.1% for stocks and 0.01% for derivatives—50 times smaller than what TruthOut is advocating.

At the end, they offer another “compromise”:

Okay, half it again, to a 2.5 percent tax on stocks and bonds and a 0.25 percent on derivative trades. That certainly won’t discourage stock and bond trading by the rich (not that that is an all bad idea either).

Yes it will. By a lot. That’s the whole point.

A financial transaction tax is a great idea whose time has come; let’s not ruin its reputation by setting it at a preposterous value. Just as a $15 minimum wage is probably a good idea but a $250 minimum wage is definitely a terrible idea, a 0.1% financial transaction tax could be very beneficial but a 5% financial transaction tax would clearly be disastrous.


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