What do you get a teenager who is obsessed with making money?

Take the interest at face value first. A teenager who talks about money constantly is usually told, gently, that money is not everything. They have heard it. It has never once helped.

What is actually going on is that they want some, and they do not have a way to get any. A kid with no income and a strong interest in money is in a frustrating position, and most gifts aimed at them make it worse by being about money rather than producing any.

So the useful gift is a route to earning rather than a lesson about earning.

What tends to miss. Books about mindset, which a teenager will not read. Investing apps with nothing to invest, since a kid with no income has nothing to put in. Anything framed as teaching them the value of a dollar, which they will correctly hear as a lecture in a box.

What tends to land. Something that lets them start earning this month, in whatever direction they lean. A tool for the specific work they keep talking about. A match, where you double whatever they make in the first month, which turns their interest into a deal rather than a hobby you tolerate.

If the money interest is really an investing interest, the honest answer is that investing needs money first, and a custodial Roth IRA funded by what they actually earn is the version of that which works. Earned income from something as ordinary as mowing lawns qualifies.

One thing worth resisting: treating the interest as a character flaw that needs balancing with a generosity lesson. A kid who wants to make money and then makes some tends to become generous about it on their own, and considerably faster when nobody is grading them on it.