By Phil Bak, CEO of Exponential ETFs

If you look up the word exemptive in the Oxford Dictionary, you won’t find any results. The word “exemptive,” it turns out, is actually not a word at all.

ETFs have been primarily governed by the Investment Company Act of 1940, which is essentially a rule designed for mutual funds. The “40 act rule,” as the name implies, was written up almost 80 years ago in a generation that could never imagine the efficiencies and varieties of low-cost investment options that would become available to investors today.

To launch an ETF, an issuer has always had to go to the SEC to get a specific approval known as “exemptive relief” to exempt themselves from the aspects of that same “40 act” which make the fund look… well, not like an ETF. In other words, an ETF issuer gets an approval to launch a mutual fund that isn’t, governed by an ancient mutual fund rule, but exempt from the mutual fund aspects of that rule.

Get it? Don’t stress it if you don’t – the industry is on the verge of getting an exemption from the exemptive relief requirement.

Governing by the exception is an inefficient way to oversee any industry, let alone one that has become the “Silicon Valley of Finance” (hat tip to the incomparable Eric Balchunas for that one). When you govern by exemption, exceptions abound.

Related: There is More to ETF Liquidity Than Meets the Eye

For example, a couple of fund companies received exemptions to list leverage and inverse funds before the SEC had a change of heart and refused to issue any further leverage ETF exemptions, level playing field be damned. Those early exemptive relief orders are grandfathered in, so the rule has created an oligarchy in an otherwise fiercely competitive market. Similarly, some fund companies can use custom creation and redemption baskets, while others can not. Some fund companies can offer transparent actively managed ETFs, while others also can, basically, but they just haven’t formally asked yet. The system is as inefficient as it is confusing.

But the real story here, governing by exceptions may work for an oddity of an investment vehicle, or a structure on the fringes. The ETF may have started off that way, but it has matured to the point where it is now the preferred investment vehicle of the modern investor. In fact, a recent Schwab survey declared that “Exchange Traded Funds (ETFs) are the investment vehicle of choice for 91% of Millennial investors”.

Related: 5 ETF Ideas to Hedge Against Rising Inflation

The SEC announced that they will hold a hearing on the matter on June 28. A new ETF rule could mean that the vehicle is finally being governed by its own rule, the same rules for all, and not by exception.

Since 2009, the mutual fund structure has seen net outflows of $24,439,000,000, while the ETF structure has seen net inflows of $2,102,305,000,000. You read that correctly – net outflows for mutual funds coinciding with TWO TRILLION in net inflows into ETFs.

ETFs are no longer the exception. They are the rule. And it is time for them to be governed that way.

This article originally appeared on www.ExponentialETFs.com.