Your Work Has a Half-Life. Law’s Is Short.

Your Work Has a Half-Life. Law’s Is Short.

Shane Parrish, the writer behind Farnam Street, applies a simple filter to his work: Will the effort I put in this year still be generating value five years from now? He calls this thinking in terms of equity rather than income. It’s the distinction between building something that persists and selling something that gets consumed.

When you look at legal practice through that lens—especially at the associate level—the view isn’t pretty.

The work you billed yesterday is not working hard for you today. The brief filed last month generates nothing this month. The deal closed last year is a line on your bio, not an annuity. Every morning, the meter resets to zero. You begin again.

The Billable Hour Is Non-Scalable

In every law firm, the coin of the realm is time. Judgment, sure. Knowledge, fine. Relationships, yeah, those too. But really, what counts in a law firm is cold, hard time.

And if your unit of value is time, then every hour you don’t sell is a loss. Vacation is a loss. Anything you create that doesn’t map to a billable matter is, under billable-hour logic, a loss.

Contrast this with Parrish’s model. An essay he published in 2015 is still being read, cited, shared, and paid for. The work doesn’t inform one client on one matter—it informs thousands of readers, repeatedly, across years, without him in the room. He built equity. The attorney who bills 2,200 hours this year built none.

Economists have a term for billable work: non-scalable. Output is strictly proportional to time input. You cannot separate your effort from your production. There is no mechanism by which your past work generates future value without your continued presence.

To be sure, legal knowledge compounds. The attorney who has negotiated two hundred deals sees things in a term sheet that her junior colleague cannot. Judgment sharpens. Pattern recognition improves. That is valuable. But notice what it produces: a more productive laborer. The treadmill runs more efficiently, but it runs, nonetheless.

To the dissatisfied attorneys out there: this might be what you’re sensing at 10 PM, reviewing a markup of a markup of a markup. In these moments, perhaps without realizing it, you are asking yourself: what am I actually building here? The honest answer: nothing that persists. You are building a reputation, of course, which requires continuous maintenance. But you are not building an asset. And the machine you are feeding—the large law firm—will almost certainly never be “yours” in a meaningful way.

 What Long Half-Life Looks Like

The contrast is not complicated. A successful author writes once and earns royalties for decades. A software developer contributes a library that runs billions of times without their involvement. An investor in a compounding business sits back while earnings per share grow. In each case, the work done today does not need to be redone tomorrow.

Legal practice isn’t set up this way, but that’s not an indictment. Plenty of meaningful professions—surgery, therapy, teaching—have short half-lives. And for attorneys who genuinely like the work, law is, as treadmills go, a nice one. Intellectually serious. Well-compensated. Respected. My objection is not to the treadmill’s aesthetics.

My objection is for those attorneys who sense—without quite being able to articulate it—that something is structurally wrong with the life they’ve chosen. They’re not just tired. They’re running on a machine tilted against them by design. The faster they run, the more it demands. There is no mode of legal practice in which working harder today makes working significantly easier tomorrow.

What to Do About It

Thinking in terms of equity doesn’t mean you need to flee the law like it’s a burning building. There are paths within the firm’s walls. You could build genuine intellectual property—a definitive treatise, a framework, a body of writing that outlasts any single matter. What, in other words, is your version of Marty Lipton’s poison pill? The billable-hour system won’t reward the initial investment, but the half-life is long. Alternatively, if you climb high enough at a large enough firm, associates eventually do the heavy lifting while you transition to origination. The treadmill slows. But equity partnership is increasingly elusive, the opportunity cost is high, and even that rainmaker role involves time-consuming tasks that don’t compound in any satisfying way.

If those solutions feel like rearranging the furniture, the harder option is to recognize that legal training is not a cage but an unusually powerful foundation. Use your analytical rigor, pattern recognition, and comfort amidst complexity to build something else on top of your training. Whether it’s in finance, entrepreneurship, or elsewhere, there are fields where long-half-life work is the norm rather than the aspiration.

None of these paths are easy. All require doing work the billable-hour system will not immediately reward.

Parrish’s Filter, Applied

A decade from now, will the work you did this year still be generating value? Will it have compounded? Or was it consumed?

For most attorneys, the answer is the same regardless of seniority: you traded hours for pay, and the client consumed the work. That’s not a scandal; it’s a structure. But if you’re still reading, it’s probably because your gut senses something’s off. The question—what am I actually building here?—is worth asking while you still have time to act on it.