It's a simple concept. If we assume PD gains shows up instantly and growth gains takes time to show up we can use this knowledge along with an accurate measurement (BPFSL) as an reference to determine if PD and/or growth occurs. So if one gets a permanent BPFSL increase in such a short time that growth couldnt explain it, it would suggest PD is happening just like an increase during a break would suggest that growth is happening.
With BPFSL it's been my experience that my gains seems to be able to manifest themselves very fast at the very least. |