No? You sure about that? What did you have? It cost $10, so if you avoided economic activity, it must have all been home-grown. Which means that $10 must be the pro-rated "labor" cost. How much are you "paying" yourself to do all that work?

Even a tomato sandwich is a lot of work, if you did not create any other economic activity thereby. You have to grow the tomatoes, and the wheat for the bread, maintain the cows and chickens for the milk and eggs, I suppose you could have it on sourdough, so you've got a wild yeast, rather than a commercial one. That still leaves salt. I hope you used sea salt, mining salt is notoriously difficult and laborious. And if you used any condiments other than that salt on your sandwich, that's even more work.

I like mayo on my tomato sandwiches, how about you? That's more eggs, oil, vinegar, more salt, maybe some lemon juice, sugar... your little backyard garden is starting to turn into quite the plantation.

Or maybe you bought the bread, mayo, tomatoes and salt? With $10, that leaves enough for a bag of chips, too. And that creates economic activity. Call it "I, Sandwich."