Kids Say the Darnedest Things About Commerce

A student recently showed up with a new horn, and we were both very pleased with it...

KID: This horn was supposed to cost $4000, but it's used, so it was only $2000.
ME (thinking $4K was a bit steep for that model, and doing a quick online search): That's interesting; I see one here on Amazon for only $1300.
KID: But you have to remember tax.

(I assured the kid that the sales tax on $1300 wasn't $700, and found out that, here in Texas; you'd have to spend almost $8500 to generate that much tax.)