I've heard this strategy described somewhere and I want to learn more about its history, theory, practice, etc. The problem is that I don't know what it is called so I don't know what to Google.
The strategy is that you invest a specific amount, say $1000, into an asset, say gold, and whenever that asset changes price by a certain amount you adjust your investment back to $1000. It goes down 5%, you buy a little. It goes up 5% you sell a little. So you are always buying low and selling high. As long as the price is fluctuating or going up, you'll be making a profit.
What is this strategy called?