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Do You Make Excuses Based on the One-Coin Argument?

Do You Make Excuses Based on the One-Coin Argument?I love paradoxes, parables, koans, aphorisms, fables, Secrets of Adulthood, and teaching stories of all kinds.

Several months ago, I posted about the “one-coin problem.” This is my phrase to describe what’s also known as “the argument of the growing heap”:

If ten coins are not enough to make a man rich, what if you add one coin? What if you add another? Finally, you will have to say that no one can be rich unless one coin can make him so.

Once I started looking for it, I began to notice the one-coin problem popping up in all sorts of places — in my own head, and in what other people say to me. For instance:

“It doesn’t matter if I skip the gym today. What difference will it make to miss just one work-out?”

“Who cares if my daughter doesn’t go to bed right on time this one night. A little less sleep isn’t going to make a huge difference.”

“I’m going to have dessert. One piece of cake isn’t going to kill me.”

“Tonight, I’m going to watch TV instead of read a book. I would only be able to read a chapter or two anyway, before I go to sleep.”

The one-coin problem captures a paradoxthat’s familiar to all of us: When we consider our actions, often it’s true that any one instance of an action is almost meaningless, yet at the same time,  a sum of those actions is very meaningful.

What will shape our behavior? Whether we focus on the single coin or the growing heap.

As the examples show, the one-coin argument can convincingly be deployed to allow yourself to do something (have a beer) or not do something (go to class). It’s very enticing argument!

Now that I’ve put a name to the one-coin problem, I’m doing a much better job of catching myself using it. Of course, sometimes it’s absolutely true and quite appropriate to indulge (or not) in some action, because it just doesn’t matter very much. To throw around a legal term–one of the few I remember from my days as a lawyer–some actions are of de minimis significance (so minor that they aren’t worth fussing with). But those de minimis actions do add up.

?Here’s my question for you, readers:
Do you find yourself falling prey to the one-coin argument?
In what circumstances?


I was thrilled to get to meet the delightful Joanna Goddard from A Cup of Jo. So much great material on her blog.

Are you reading Happier at Home or The Happiness Project in a book group? Email me if you’d like the one-page discussion guide. Or if you’re reading it in a spirituality book club, a Bible study group, or the like, email me for the spirituality one-page discussion guide.

Do You Make Excuses Based on the One-Coin Argument?

Gretchen Rubin

Gretchen Rubin is the award-winning author of The Happiness Project, a #1 New York Times bestseller. You can also watch the one-minute book video. She is a regular contributor to Psych Central.

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APA Reference
Rubin, G. (2018). Do You Make Excuses Based on the One-Coin Argument?. Psych Central. Retrieved on November 23, 2020, from
Scientifically Reviewed
Last updated: 8 Jul 2018 (Originally: 9 Mar 2013)
Last reviewed: By a member of our scientific advisory board on 8 Jul 2018
Published on Psych All rights reserved.