The value of a unit labor / a unit of gold is only one factor right now.
The opportunity cost of lost value in a collapse of the currency is actually much greater than the unit value of labor alone. If the record of labor held in paper dollars is burned up in inflation and devaluation then the insurance value of hard currency in the form of anything of tangible value is skewed to reflect that also. That's one I'm not sure we can put a real value on though... I suppose you could look at M3 and project what would happen during the collapse and try to forcast the lost value and link that to whatever hard currency... precious metals, food, water or energy. We're in a situation that we have never been in before so trying to quantify it is next to impossible... but whatever happens there are none of us that will be untouched by the meltdown... I'm just glad I'm old... but am very frightened for my kids and grandkids. It's time for a revolution... but Americans are too soft and spoiled for that to happen while they still have full bellies... and when their bellies get empty it will be too late to pull it off.