What affects power more in a camshaft....high lift or longer duration?

Ok, just a question for the uninitiated...

Doesn't more lift inherently result in slightly more duration for a given base circle?

I get faster ramps but comparing old to old (slower ramps), or modern to modern (faster ramps), doesn't a measurable amount of duration come along for the ride as the lift increases? My ASSumption is the higher lift will require the ramps to widen slightly to accommodate the additional lift.

??
Very slightly. I think the change in duration going from 1.5 to 1.6 for example, is under 2 degrees, but yes, it does make a very small difference.