So given sufficient foresight, the prospect of a 1980 punishment hurts the 1950 owners, even if they sell in the interim.
1950 owners would be wise to avoid this so they will not be punished later on.
mnli hypothesis: 1950 owners would be wise to avoid this so they will not be punished later on. premise: So given sufficient foresight, the prospect of a 1980 punishment hurts the 1950 owners, even if they sell in the interim.