[polygamous_bat]

> Taxing this decision discourages making it—even if only marginally—and makes capital markets dumber and less efficient.

Or it encourages making longer term investment decisions rather than trading like a jittery cocaine addict (which by no small amount of irony a nonnegligible number of traders are already.)

[twoodfin]

What you’re suggesting is that markets are more efficient when they’re less liquid. That’s both intuitively and empirically wrong.

[polygamous_bat]

Why? We already have regulations such as circuit breakers in our markets because unlike what you are claiming, absolute liquidity is not the god you think it is. There can absolutely be such a thing as over-optimization.

[stouset]

They are likely suggesting that incremental, hypothetical increases in market efficiency appear to come at increasingly steep costs which primarily borne by the rest of society at large.

[twoodfin]

And the evidence for this is … ?

[polygamous_bat]

Front-running is an easy example.

[kasey_junk]

Front running is illegal.

[lotsofpulp]

So place a limit order.

[polygamous_bat]

Do you also preach everyone to learn self-defense when they propose making mugging illegal?

No, in the best world we do both.

[stouset]

Finance is 12% of the entire US economy.

[twoodfin]

What’s the right %?

[stouset]

Clearly less than 12%.

[BeFlatXIII]

What extra liquidity is there for executing trades every microsecond instead of batching them up for thrice a minute trades?