Re Biotech, I used to own IBB when it was on its move up and using Don Carlson's ladder method it sold out. It was a similar method to LD-AIM in that it had a finite sales and then you'd be out.
At this point I'm more into style rather than sector ETFs as the periods of the sector cycles are very long and I no longer have the patience. The style ETFs are safer IMO. The two sectors I still own are IYE and IYZ.
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