"Are quills cool, or just stars?" 

"Quills are weird and I'm gonna bring pens too."

"Quills are swoopy, but harder to use," he agrees. 

"Why do wizards do everything so differently? Is it hard to make pens, or do they just not do things Muggles do first?" 

"I dunno, I think they're just very slow to invent things and there's not a lot of them and they don't pay attention to stuff muggles invent without magic."

"We should invent lots of things, then wizards won't be so slow." 

"We should! And bring lots of science to them."

"Do we know lots of science?"

"Well I do. For an eleven-year-old anyway."

"I know animals, and diseases, and plants. That's kind of science." 

"It's totally science, but I think they also know those things."

"Maybe I know more! I'll learn everything there is to know about diseases and then all the wizards will come to me to feel better." 

"That's the spirit!"

"Honey, you might want to learn the basics before you go for really complex magic."

"No, I learn Muggle medicine while I'm learning basic magic stuff, and then I focus on magical plants and potions and things while I'm learning about Richard Feynman. Do you have a book on him?"

"I have books by him. And an autobiography. He was a bit of a butt but he was smart."

"I think I'll read the books and not the autobiography. If I borrow those, you can have...I don't know what you like, I'll just get you a really good Christmas present when I know you better." 

"Well I like books. And puzzles. And music."

"So, I'll get you a really tricky book, that's kind of like a puzzle! And music too, that's separate." 

"Deal!"

And they arrive at the shop.

Parchment, quills, and various other essentials for every aspiring Hogwarts student. 

Capitalism! Sort of!

Close enough, yes.

The Woods can exchange money for goods.

"How do they make quills?"

"I think they pluck them off animals?"

"Are they careful? Wizards don't seem very careful."