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Yeah I just don't see much reason to suspect investors have more of a capital gain that can be soaked up than owner occupiers - probably less as they may have interest only mortgages, professional investors will have gearing targets, and investment horizons are probably shorter than how long it is between home moves.
I take your point on no negative equity but it's not just that - it's anything that pushes your LTV to a bad level that makes price drops a problem. You don't have to be underwater to find going from 75% ltv to 95% sucks
I presume @Soul is talking about cash buyers.
For live-in homeowners, if there is a short to medium term fall, then as long as negative equity doesn't apply, it does mean that moving up the ladder is easier as the absolute gap between properties also falls. Every cloud and all that.