"...okay."

"Do you go out and buy yourself presents with your Christmas money?" she wonders. "So people can know what they would've got you if they'd known exactly what to get you?"

"Sometimes, yeah. Sometimes I save up for bigger stuff."

"Which is it this year?"

"Saving up."

"What for?"

"A store. Muggle store, probably, or at least Muggle storefront, the manufacturing might be magic."

"Ooooooh, what are you going to sell?"

"Haven't decided yet. I'm really excited about mass production but that leaves lots of options."

"A bit, yes. Where are you going to have your store?"

"London."

"Ooh, Miranda lives in London."

"Yeah, we have an apartment on Plur Alley."

"And so do a lot of Muggles! The city population's growing really fast."

"It's a pretty neat city!"

"It's a great business opportunity!"

"...okay just checking do you think about other things sometimes ever? Like, do you ever think about what you're going to have for lunch. Or about the weather."

"...yeah? I like cinnamon and apples that aren't quite ripe yet and my favorite weather is when it's cloudy but not raining. And I love my family."

"Okay good."

"Why?"

"It just seems like it'd be a little sad if you only ever thought about one thing."

"Well, it wouldn't make me sad, and my head belongs to me, not other people."

"...uh, sorry..."

He glances at Timothy for help. 

"He does have a way of relating everything back to his favorite subject," he says. "Aaron, 'what else are you interested in' isn't an unreasonable question, people might want to know if they will find it enjoyable to talk with you when they're not in the mood to talk about economics."