SF has already done that one, too. See “Compound Interest” by Mack Reynolds. It doesn’t appear to be in Project Gutenberg (no doubt still under copyright), but here’s a summary:
The story starts with the beginning of the annual meeting of the board of directors of a corporation. This is to be an unusual meeting, so first they review the corporation history. It seems the corporation began when a man approached a banker in Renaissance Italy with a bag of gold he wished to invest. The investor gives some general guidelines as to how the investment is to be done, but leaves the details to the banker. He then disappears for N (I forget what N is, but I think 50) years.
And so it goes. Every N years, the Mysterious Investor shows up to review the books and give more advice. The advice is usually that country A will be a good place to invest until year X and country B will start to be a good investment locale begining in year Y. That kind of thing. It turns out that all the advice is accurate and with that kind of help, the corporation flourishes and is now one of the richest companies in the world.
OK, it’s now been N years since the last appearance of the Mysterious Investor, so they’re expecting him to show up at this board meeting.
In the meantime, they’ve asked Professor So-and-so about the possibility of time travel being feasible, since they figure the Mysterious Investor is a time traveller. The Professor shows up and it turns out he’s the Investor. He’s here to start the liquidation of the company, since he’s going to need lots of funds to perform the experiments to develop a time travel machine…