Just wondering if anyone has looked into this.
Fidelity offers one to exchange funds, sell from one fund, buy into another on the same day. They also list a funds top ten holdings.
Now imagine you own 2 funds with dissimilar holdings. On a day where the stocks in fund A is down, and the stocks in fund B are up you exchange from B into A. When the situation is reversed you do the same.
Assuming you want to play with 5k, and you only take advantage when the delta is 2% or more. Even if this occurs only 20 times during the year, it is a free $2,000.
Obviously you use a spreadsheet to do the math.