I’d like an extra piece of cheese on my burger, please.

Sir, that will cost you extra.

Extra what?

Extra calories.

So, I can pay for my extra cheese with calories?

No sir. And it will cost you extra efforts in your digestive process.

How much extra will it cost me? In extra dollars I mean.

An extra 41 cents.

Okay, I’ll pay the extra.

But there are extra externalities involved in this choice of yours. Are you prepared to meet extra costs such as post-burger sluggishness, weight-gain, high blood pressure, and a desire to purchase additional pairs of sweatpants to alleviate the stress pressing against your waist?

Yes to all the extra costs except the sweats—a man must keep his dignity.

Sorry for being so extra sir. I didn’t recognize that I was dealing with such a dignified man.